feat: rename keep-notes to memento-note, migrate to PostgreSQL, fix MCP bugs

- Rename directory keep-notes -> memento-note with all code references
- Prisma: SQLite -> PostgreSQL (both app and MCP server schemas)
- Sync MCP schema with main app (add missing fields, relations, indexes)
- Delete 17 SQLite migrations (clean slate for PostgreSQL)
- Remove SQLite dependencies (@libsql/client, better-sqlite3, etc.)
- Fix MCP server: hardcoded Windows DB paths -> DATABASE_URL env var
- Fix MCP server: .dockerignore excluded index-sse.js (SSE mode broken)
- MCP Dockerfile: node:20 -> node:22
- Docker Compose: add postgres service, remove SQLite volume
- Generate favicon.ico, icon-192.png, icon-512.png, apple-icon.png
- Update layout.tsx icons and manifest.json for PNG icons
- Update all .env files for PostgreSQL
- Rewrite README.md with updated sections
- Remove mcp-server/node_modules and prisma/client-generated from git tracking

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

memento-note/hooks/use-auto-label-suggestion.ts

@@ -0,0 +1,62 @@
+import { useState, useEffect } from 'react'
+import { useSearchParams } from 'next/navigation'
+import { useSession } from 'next-auth/react'
+
+/**
+ * Hook to check if auto label suggestions should be shown for the current notebook
+ * Triggers when notebook has 15+ notes (IA4)
+ */
+export function useAutoLabelSuggestion() {
+  const { data: session } = useSession()
+  const searchParams = useSearchParams()
+  const [shouldSuggest, setShouldSuggest] = useState(false)
+  const [notebookId, setNotebookId] = useState<string | null>(searchParams.get('notebook'))
+  const [hasChecked, setHasChecked] = useState(false)
+
+  useEffect(() => {
+    const currentNotebookId = searchParams.get('notebook')
+
+    // Reset when notebook changes
+    if (currentNotebookId !== notebookId) {
+      setNotebookId(currentNotebookId)
+      setHasChecked(false)
+      setShouldSuggest(false)
+
+      // Check if we should suggest labels for this notebook
+      if (currentNotebookId && session?.user?.id) {
+        checkNotebookForSuggestions(currentNotebookId)
+      }
+    }
+  }, [searchParams, notebookId, session])
+
+  const checkNotebookForSuggestions = async (nbId: string) => {
+    try {
+      // Check if notebook has 15+ notes
+      const response = await fetch('/api/ai/auto-labels', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ notebookId: nbId }),
+      })
+
+      const data = await response.json()
+
+      // Show suggestions if available
+      if (data.success && data.data) {
+        setShouldSuggest(true)
+      }
+
+      setHasChecked(true)
+    } catch (error) {
+      console.error('Failed to check for label suggestions:', error)
+      setHasChecked(true)
+    }
+  }
+
+  return {
+    shouldSuggest,
+    notebookId,
+    hasChecked,
+    dismiss: () => setShouldSuggest(false),
+  }
+}