feat: App mobile Expo + API mobile dédiée

memento-mobile/ (Expo + React Native + expo-router):
- Auth: login email/password → Bearer token (expo-secure-store)
- Layout: guard auth → redirect /(auth)/login ou /(tabs)/home
- Tabs: Accueil, Carnets, Recherche, Profil
- Screens: login, home (recent notes + quick actions), notebooks list,
  note viewer (WebView HTML), search (texte), notebook detail, profile
- Design: tokens brand-accent (#A47148), ink, concrete, paper, border
- lib/config.ts: API_URL dev/prod configurable
- lib/api.ts: apiFetch avec Bearer token automatique
- lib/store.ts: Zustand auth store (login/logout/restore)

memento-note/ (API mobile dédiée):
- lib/mobile-auth.ts: createMobileToken / verifyMobileToken (HMAC-SHA256, 90j)
- POST /api/mobile/auth/login: email+password → token + user
- GET /api/mobile/auth/me: valider token, retourner profil
- GET /api/mobile/notebooks: liste carnets avec nb notes
- GET /api/mobile/notes: notes récentes (filtre par carnet optionnel)
- GET /api/mobile/notes/[id]: contenu complet d'une note
- GET /api/mobile/search: recherche fulltext titre+contenu

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

memento-mobile/app/(tabs)/_layout.tsx

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+import { Tabs } from 'expo-router'
+import { BookOpen, Search, Home, User } from 'lucide-react-native'
+
+export default function TabsLayout() {
+  return (
+    <Tabs
+      screenOptions={{
+        headerShown: false,
+        tabBarActiveTintColor: '#A47148',
+        tabBarInactiveTintColor: '#8A8A82',
+        tabBarStyle: {
+          backgroundColor: '#FAFAF8',
+          borderTopColor: '#E8E6E0',
+          borderTopWidth: 1,
+          paddingBottom: 4,
+          height: 60,
+        },
+        tabBarLabelStyle: {
+          fontSize: 10,
+          fontWeight: '600',
+          marginTop: -2,
+        },
+      }}
+    >
+      <Tabs.Screen
+        name="home"
+        options={{
+          title: 'Accueil',
+          tabBarIcon: ({ color, size }) => <Home size={size} color={color} />,
+        }}
+      />
+      <Tabs.Screen
+        name="notebooks"
+        options={{
+          title: 'Carnets',
+          tabBarIcon: ({ color, size }) => <BookOpen size={size} color={color} />,
+        }}
+      />
+      <Tabs.Screen
+        name="search"
+        options={{
+          title: 'Recherche',
+          tabBarIcon: ({ color, size }) => <Search size={size} color={color} />,
+        }}
+      />
+      <Tabs.Screen
+        name="profile"
+        options={{
+          title: 'Profil',
+          tabBarIcon: ({ color, size }) => <User size={size} color={color} />,
+        }}
+      />
+    </Tabs>
+  )
+}

memento-mobile/app/(tabs)/home.tsx

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+import { useEffect, useState } from 'react'
+import {
+  View, Text, ScrollView, TouchableOpacity,
+  ActivityIndicator, RefreshControl,
+} from 'react-native'
+import { SafeAreaView } from 'react-native-safe-area-context'
+import { useRouter } from 'expo-router'
+import { CalendarDays, Sparkles, BookOpen } from 'lucide-react-native'
+import { apiFetch } from '@/lib/api'
+import { ENDPOINTS } from '@/lib/config'
+import { useAuthStore } from '@/lib/store'
+
+interface Note {
+  id: string
+  title: string
+  updatedAt: string
+  notebookName?: string
+  color?: string
+}
+
+export default function HomeScreen() {
+  const user = useAuthStore((s) => s.user)
+  const [recentNotes, setRecentNotes] = useState<Note[]>([])
+  const [loading, setLoading] = useState(true)
+  const [refreshing, setRefreshing] = useState(false)
+  const router = useRouter()
+
+  const load = async () => {
+    try {
+      const res = await apiFetch(ENDPOINTS.notes())
+      if (res.ok) {
+        const data = await res.json()
+        setRecentNotes((data.notes ?? []).slice(0, 10))
+      }
+    } finally {
+      setLoading(false)
+      setRefreshing(false)
+    }
+  }
+
+  useEffect(() => { load() }, [])
+
+  const handleDailyNote = async () => {
+    const res = await apiFetch(ENDPOINTS.dailyNote)
+    if (res.ok) {
+      const data = await res.json()
+      router.push(`/note/${data.id}`)
+    }
+  }
+
+  const formatDate = (iso: string) => {
+    const d = new Date(iso)
+    return d.toLocaleDateString('fr-FR', { day: 'numeric', month: 'short' })
+  }
+
+  return (
+    <SafeAreaView className="flex-1 bg-paper">
+      <ScrollView
+        className="flex-1"
+        refreshControl={<RefreshControl refreshing={refreshing} onRefresh={() => { setRefreshing(true); load() }} tintColor="#A47148" />}
+      >
+        {/* Header */}
+        <View className="px-5 pt-4 pb-2">
+          <Text className="text-2xl font-serif italic text-ink">
+            Bonjour{user?.name ? `, ${user.name.split(' ')[0]}` : ''} 👋
+          </Text>
+          <Text className="text-[13px] text-concrete mt-0.5">
+            {new Date().toLocaleDateString('fr-FR', { weekday: 'long', day: 'numeric', month: 'long' })}
+          </Text>
+        </View>
+
+        {/* Quick actions */}
+        <View className="flex-row gap-3 px-5 mt-4">
+          <TouchableOpacity
+            onPress={handleDailyNote}
+            className="flex-1 bg-white border border-border rounded-2xl p-4 items-center gap-2"
+          >
+            <CalendarDays size={22} color="#A47148" />
+            <Text className="text-[12px] font-semibold text-ink">Note du jour</Text>
+          </TouchableOpacity>
+          <TouchableOpacity
+            onPress={() => router.push('/(tabs)/notebooks')}
+            className="flex-1 bg-white border border-border rounded-2xl p-4 items-center gap-2"
+          >
+            <BookOpen size={22} color="#A47148" />
+            <Text className="text-[12px] font-semibold text-ink">Carnets</Text>
+          </TouchableOpacity>
+          <TouchableOpacity
+            onPress={() => router.push('/(tabs)/search')}
+            className="flex-1 bg-white border border-border rounded-2xl p-4 items-center gap-2"
+          >
+            <Sparkles size={22} color="#A47148" />
+            <Text className="text-[12px] font-semibold text-ink">Recherche IA</Text>
+          </TouchableOpacity>
+        </View>
+
+        {/* Recent notes */}
+        <View className="px-5 mt-6">
+          <Text className="text-[11px] font-bold uppercase tracking-widest text-concrete mb-3">
+            Récentes
+          </Text>
+
+          {loading ? (
+            <ActivityIndicator color="#A47148" />
+          ) : recentNotes.length === 0 ? (
+            <Text className="text-concrete text-[14px]">Aucune note pour l'instant.</Text>
+          ) : (
+            recentNotes.map((note) => (
+              <TouchableOpacity
+                key={note.id}
+                onPress={() => router.push(`/note/${note.id}`)}
+                className="bg-white border border-border rounded-2xl p-4 mb-2.5 active:opacity-70"
+              >
+                <Text className="text-[15px] font-semibold text-ink" numberOfLines={1}>
+                  {note.title || 'Sans titre'}
+                </Text>
+                <View className="flex-row items-center gap-2 mt-1">
+                  {note.notebookName && (
+                    <Text className="text-[11px] text-concrete">{note.notebookName}</Text>
+                  )}
+                  <Text className="text-[11px] text-concrete/60">{formatDate(note.updatedAt)}</Text>
+                </View>
+              </TouchableOpacity>
+            ))
+          )}
+        </View>
+
+        <View className="h-8" />
+      </ScrollView>
+    </SafeAreaView>
+  )
+}

memento-mobile/app/(tabs)/notebooks.tsx

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+import { useEffect, useState } from 'react'
+import {
+  View, Text, FlatList, TouchableOpacity,
+  ActivityIndicator, RefreshControl,
+} from 'react-native'
+import { SafeAreaView } from 'react-native-safe-area-context'
+import { useRouter } from 'expo-router'
+import { ChevronRight } from 'lucide-react-native'
+import { apiFetch } from '@/lib/api'
+import { ENDPOINTS } from '@/lib/config'
+
+interface Notebook {
+  id: string
+  name: string
+  icon: string | null
+  _count: { notes: number }
+}
+
+export default function NotebooksScreen() {
+  const [notebooks, setNotebooks] = useState<Notebook[]>([])
+  const [loading, setLoading] = useState(true)
+  const [refreshing, setRefreshing] = useState(false)
+  const router = useRouter()
+
+  const load = async () => {
+    try {
+      const res = await apiFetch(ENDPOINTS.notebooks)
+      if (res.ok) {
+        const data = await res.json()
+        setNotebooks(data.notebooks ?? [])
+      }
+    } finally {
+      setLoading(false)
+      setRefreshing(false)
+    }
+  }
+
+  useEffect(() => { load() }, [])
+
+  if (loading) {
+    return (
+      <SafeAreaView className="flex-1 bg-paper items-center justify-center">
+        <ActivityIndicator color="#A47148" />
+      </SafeAreaView>
+    )
+  }
+
+  return (
+    <SafeAreaView className="flex-1 bg-paper">
+      <View className="px-5 pt-4 pb-2">
+        <Text className="text-2xl font-serif italic text-ink">Carnets</Text>
+      </View>
+
+      <FlatList
+        data={notebooks}
+        keyExtractor={(item) => item.id}
+        contentContainerClassName="px-5 pb-8"
+        refreshControl={<RefreshControl refreshing={refreshing} onRefresh={() => { setRefreshing(true); load() }} tintColor="#A47148" />}
+        renderItem={({ item }) => (
+          <TouchableOpacity
+            onPress={() => router.push(`/notebook/${item.id}`)}
+            className="flex-row items-center bg-white border border-border rounded-2xl p-4 mb-2.5 active:opacity-70"
+          >
+            <Text className="text-2xl mr-3">{item.icon ?? '📓'}</Text>
+            <View className="flex-1">
+              <Text className="text-[15px] font-semibold text-ink">{item.name}</Text>
+              <Text className="text-[12px] text-concrete">{item._count?.notes ?? 0} notes</Text>
+            </View>
+            <ChevronRight size={16} color="#8A8A82" />
+          </TouchableOpacity>
+        )}
+        ListEmptyComponent={
+          <Text className="text-concrete text-center mt-12">Aucun carnet.</Text>
+        }
+      />
+    </SafeAreaView>
+  )
+}

memento-mobile/app/(tabs)/profile.tsx

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+import { View, Text, TouchableOpacity, ScrollView, Alert } from 'react-native'
+import { SafeAreaView } from 'react-native-safe-area-context'
+import { LogOut, CreditCard, Globe } from 'lucide-react-native'
+import { useAuthStore } from '@/lib/store'
+
+const TIER_LABELS: Record<string, string> = {
+  FREE: 'Gratuit',
+  BASIC: 'Basic',
+  PRO: 'Pro',
+  BUSINESS: 'Business',
+  ENTERPRISE: 'Enterprise',
+}
+
+export default function ProfileScreen() {
+  const { user, logout } = useAuthStore()
+
+  const handleLogout = () => {
+    Alert.alert(
+      'Se déconnecter',
+      'Voulez-vous vraiment vous déconnecter ?',
+      [
+        { text: 'Annuler', style: 'cancel' },
+        { text: 'Déconnecter', style: 'destructive', onPress: logout },
+      ]
+    )
+  }
+
+  return (
+    <SafeAreaView className="flex-1 bg-paper">
+      <ScrollView className="flex-1 px-5">
+        <Text className="text-2xl font-serif italic text-ink pt-4 pb-6">Profil</Text>
+
+        {/* User info */}
+        <View className="bg-white border border-border rounded-2xl p-5 mb-4">
+          <View className="w-14 h-14 rounded-full bg-brand/10 items-center justify-center mb-3">
+            <Text className="text-2xl font-bold text-brand">
+              {user?.name?.[0]?.toUpperCase() ?? user?.email?.[0]?.toUpperCase() ?? '?'}
+            </Text>
+          </View>
+          <Text className="text-[17px] font-semibold text-ink">{user?.name ?? 'Utilisateur'}</Text>
+          <Text className="text-[13px] text-concrete mt-0.5">{user?.email}</Text>
+          {user?.tier && (
+            <View className="mt-3 self-start bg-brand/10 px-3 py-1 rounded-full">
+              <Text className="text-[11px] font-bold text-brand uppercase tracking-wider">
+                {TIER_LABELS[user.tier] ?? user.tier}
+              </Text>
+            </View>
+          )}
+        </View>
+
+        {/* Actions */}
+        <View className="bg-white border border-border rounded-2xl overflow-hidden mb-4">
+          <TouchableOpacity className="flex-row items-center gap-3 px-4 py-3.5 border-b border-border active:bg-border/20">
+            <CreditCard size={18} color="#8A8A82" />
+            <Text className="text-[15px] text-ink flex-1">Abonnement</Text>
+          </TouchableOpacity>
+          <TouchableOpacity className="flex-row items-center gap-3 px-4 py-3.5 active:bg-border/20">
+            <Globe size={18} color="#8A8A82" />
+            <Text className="text-[15px] text-ink flex-1">Ouvrir memento-note.com</Text>
+          </TouchableOpacity>
+        </View>
+
+        <TouchableOpacity
+          onPress={handleLogout}
+          className="bg-white border border-rose-200 rounded-2xl flex-row items-center gap-3 px-4 py-3.5 active:opacity-70"
+        >
+          <LogOut size={18} color="#e11d48" />
+          <Text className="text-[15px] text-rose-600 font-medium">Se déconnecter</Text>
+        </TouchableOpacity>
+      </ScrollView>
+    </SafeAreaView>
+  )
+}

memento-mobile/app/(tabs)/search.tsx

@@ -0,0 +1,106 @@
+import { useState } from 'react'
+import {
+  View, Text, TextInput, FlatList,
+  TouchableOpacity, ActivityIndicator,
+} from 'react-native'
+import { SafeAreaView } from 'react-native-safe-area-context'
+import { Search as SearchIcon, X } from 'lucide-react-native'
+import { useRouter } from 'expo-router'
+import { apiFetch } from '@/lib/api'
+import { ENDPOINTS } from '@/lib/config'
+
+interface SearchResult {
+  id: string
+  title: string
+  snippet: string
+  notebookName?: string
+  score?: number
+}
+
+export default function SearchScreen() {
+  const [query, setQuery] = useState('')
+  const [results, setResults] = useState<SearchResult[]>([])
+  const [loading, setLoading] = useState(false)
+  const [searched, setSearched] = useState(false)
+  const router = useRouter()
+
+  const handleSearch = async () => {
+    if (!query.trim()) return
+    setLoading(true)
+    setSearched(true)
+    try {
+      const res = await apiFetch(`${ENDPOINTS.search}?q=${encodeURIComponent(query)}`)
+      if (res.ok) {
+        const data = await res.json()
+        setResults(data.results ?? [])
+      }
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <SafeAreaView className="flex-1 bg-paper">
+      <View className="px-5 pt-4 pb-2">
+        <Text className="text-2xl font-serif italic text-ink mb-4">Recherche</Text>
+
+        <View className="flex-row items-center bg-white border border-border rounded-xl px-3 py-2.5 gap-2">
+          <SearchIcon size={16} color="#8A8A82" />
+          <TextInput
+            value={query}
+            onChangeText={setQuery}
+            placeholder="Chercher dans vos notes…"
+            className="flex-1 text-[15px] text-ink"
+            placeholderTextColor="#8A8A82"
+            returnKeyType="search"
+            onSubmitEditing={handleSearch}
+          />
+          {query.length > 0 && (
+            <TouchableOpacity onPress={() => { setQuery(''); setResults([]); setSearched(false) }}>
+              <X size={14} color="#8A8A82" />
+            </TouchableOpacity>
+          )}
+        </View>
+      </View>
+
+      {loading ? (
+        <View className="flex-1 items-center justify-center">
+          <ActivityIndicator color="#A47148" />
+        </View>
+      ) : (
+        <FlatList
+          data={results}
+          keyExtractor={(item) => item.id}
+          contentContainerClassName="px-5 pt-3 pb-8"
+          renderItem={({ item }) => (
+            <TouchableOpacity
+              onPress={() => router.push(`/note/${item.id}`)}
+              className="bg-white border border-border rounded-2xl p-4 mb-2.5 active:opacity-70"
+            >
+              <Text className="text-[15px] font-semibold text-ink" numberOfLines={1}>
+                {item.title || 'Sans titre'}
+              </Text>
+              {item.snippet && (
+                <Text className="text-[12px] text-concrete mt-1" numberOfLines={2}>
+                  {item.snippet}
+                </Text>
+              )}
+              {item.notebookName && (
+                <Text className="text-[11px] text-concrete/60 mt-1">{item.notebookName}</Text>
+              )}
+            </TouchableOpacity>
+          )}
+          ListEmptyComponent={
+            searched ? (
+              <Text className="text-concrete text-center mt-12">Aucun résultat pour "{query}"</Text>
+            ) : (
+              <Text className="text-concrete text-center mt-12 text-[13px]">
+                Tapez votre recherche puis appuyez sur Entrée
+              </Text>
+            )
+          }
+        />
+      )}
+    </SafeAreaView>
+  )
+}