feat(credits): solde IA unique (option M), packs Stripe et polish billing

Un pot de crédits global (BASIC 100 / PRO 1 000 / BUSINESS 4 000) remplace
les seaux par fonction côté débit. Packs one-shot S/M/L, admin sans seaux
legacy, usage multi-features, hints de coût, anti-flash thème et hydratation
admin. Inclut aussi le pipeline slides renforcé et la page publique polishée.

memento-note/app/actions/admin-billing.ts

@@ -19,6 +19,9 @@ const BILLING_CONFIG_KEYS = [
   'STRIPE_PRICE_PRO_ANNUAL',
   'STRIPE_PRICE_BUSINESS_MONTHLY',
   'STRIPE_PRICE_BUSINESS_ANNUAL',
+  'STRIPE_PRICE_CREDITS_S',
+  'STRIPE_PRICE_CREDITS_M',
+  'STRIPE_PRICE_CREDITS_L',
 ] as const
 
 const TIERS: TierType[] = ['BASIC', 'PRO', 'BUSINESS', 'ENTERPRISE']
@@ -54,7 +57,42 @@ export async function getBillingAdminData() {
     BILLING_CONFIG_KEYS.map((key) => [key, config[key] ?? '']),
   )
 
-  return { entitlements, billingConfig, usageOverview, features: [...VALID_FEATURES], tiers: TIERS }
+  const { CREDIT_ALLOCATIONS, CREDIT_COSTS, slideGenerateCreditCost } = await import('@/lib/credits')
+  const { CREDIT_PACKS, CREDIT_PACK_IDS } = await import('@/lib/billing/credit-packs')
+
+  const creditAllocations = TIERS.map((tier) => {
+    const raw = CREDIT_ALLOCATIONS[tier]
+    return {
+      tier,
+      monthlyCredits: raw === 'unlimited' ? null : raw,
+      unlimited: raw === 'unlimited',
+    }
+  })
+
+  const creditCosts = {
+    ...CREDIT_COSTS,
+    slide_generate_example: slideGenerateCreditCost(7),
+  }
+
+  const creditPacks = CREDIT_PACK_IDS.map((id) => {
+    const p = CREDIT_PACKS[id]
+    return {
+      id: p.id,
+      credits: p.credits,
+      defaultDisplay: p.defaultDisplay,
+    }
+  })
+
+  return {
+    entitlements,
+    billingConfig,
+    usageOverview,
+    features: [...VALID_FEATURES],
+    tiers: TIERS,
+    creditAllocations,
+    creditCosts,
+    creditPacks,
+  }
 }
 
 export async function updatePlanEntitlement(

memento-note/app/actions/admin-settings.ts

@@ -42,24 +42,47 @@ export async function getSystemConfig() {
   return getCachedConfig()
 }
 
+/** Keys that may be cleared (empty string) to fall back to chat / defaults. */
+const CLEARABLE_CONFIG_KEYS = new Set([
+  'AI_PROVIDER_SLIDES',
+  'AI_MODEL_SLIDES',
+])
+
 export async function updateSystemConfig(data: Record<string, string>) {
   await checkAdmin()
 
   try {
-    // Filter out empty values but keep 'false' as valid
-    const filteredData = Object.fromEntries(
-      Object.entries(data).filter(([key, value]) => value !== '' && value !== null && value !== undefined)
-    )
+    // Filter out empty values but keep 'false' as valid.
+    // Slides provider/model may be empty intentionally (= use Chat fallback).
+    const toUpsert: Record<string, string> = {}
+    const toDelete: string[] = []
 
-    const operations = Object.entries(filteredData).map(([key, value]) =>
-      prisma.systemConfig.upsert({
-        where: { key },
-        update: { value },
-        create: { key, value }
-      })
-    )
+    for (const [key, value] of Object.entries(data)) {
+      if (value === null || value === undefined) continue
+      if (value === '' && CLEARABLE_CONFIG_KEYS.has(key)) {
+        toDelete.push(key)
+        continue
+      }
+      if (value === '') continue
+      toUpsert[key] = value
+    }
 
-    await prisma.$transaction(operations)
+    const operations = [
+      ...Object.entries(toUpsert).map(([key, value]) =>
+        prisma.systemConfig.upsert({
+          where: { key },
+          update: { value },
+          create: { key, value },
+        }),
+      ),
+      ...toDelete.map((key) =>
+        prisma.systemConfig.deleteMany({ where: { key } }),
+      ),
+    ]
+
+    if (operations.length > 0) {
+      await prisma.$transaction(operations)
+    }
 
     return { success: true }
   } catch (error) {

memento-note/app/actions/admin.ts

@@ -186,3 +186,60 @@ export async function updateUserSubscription(userId: string, tier: string) {
     throw new Error('Failed to update subscription')
   }
 }
+
+/**
+ * Remet à zéro les crédits IA + anciens compteurs feature du mois pour un utilisateur.
+ * @param feature (optionnel, legacy) — le reset crédits est global ; feature ignorée pour le solde.
+ */
+export async function resetUserQuotas(userId: string, feature?: string) {
+  const session = await checkAdmin()
+
+  if (!userId?.trim()) {
+    throw new Error('Identifiant utilisateur manquant')
+  }
+
+  const user = await prisma.user.findUnique({
+    where: { id: userId },
+    select: { id: true, email: true },
+  })
+  if (!user) {
+    throw new Error('Utilisateur introuvable')
+  }
+
+  // Nouveau système : solde de crédits global
+  const { adminResetCredits } = await import('@/lib/credits')
+  const balance = await adminResetCredits(userId, { clearPurchased: false })
+
+  // Ancien système feature (compat / métriques)
+  const { resetUserUsageForCurrentPeriod } = await import('@/lib/entitlements')
+  const legacy = await resetUserUsageForCurrentPeriod(
+    userId,
+    feature ? { features: [feature] } : undefined,
+  )
+
+  const { logAuditEventAsync } = await import('@/lib/audit-log')
+  await logAuditEventAsync({
+    userId: session.user?.id,
+    action: 'QUOTA_RESET',
+    resource: userId,
+    metadata: {
+      targetUserId: userId,
+      targetEmail: user.email,
+      period: balance.period,
+      creditsRemaining: balance.unlimited ? 'unlimited' : balance.totalRemaining,
+      legacyFeaturesReset: legacy.featuresReset,
+      scope: feature || 'all',
+    },
+  })
+
+  revalidatePath('/admin')
+  revalidatePath('/admin/users')
+  return {
+    success: true as const,
+    period: balance.period,
+    featuresReset: legacy.featuresReset,
+    redisDeleted: legacy.redisDeleted,
+    dbUpdated: legacy.dbUpdated,
+    creditsRemaining: balance.unlimited ? null : balance.totalRemaining,
+  }
+}