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/app/api/ai/auto-labels/route.ts

@@ -0,0 +1,122 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { autoLabelCreationService } from '@/lib/ai/services'
+
+/**
+ * POST /api/ai/auto-labels - Suggest new labels for a notebook
+ */
+export async function POST(request: NextRequest) {
+  try {
+    const session = await auth()
+
+    if (!session?.user?.id) {
+      return NextResponse.json(
+        { success: false, error: 'Unauthorized' },
+        { status: 401 }
+      )
+    }
+
+    const body = await request.json()
+    const { notebookId, language = 'en' } = body
+
+    if (!notebookId || typeof notebookId !== 'string') {
+      return NextResponse.json(
+        { success: false, error: 'Missing required field: notebookId' },
+        { status: 400 }
+      )
+    }
+
+    // Check if notebook belongs to user
+    const { prisma } = await import('@/lib/prisma')
+    const notebook = await prisma.notebook.findFirst({
+      where: {
+        id: notebookId,
+        userId: session.user.id,
+      },
+    })
+
+    if (!notebook) {
+      return NextResponse.json(
+        { success: false, error: 'Notebook not found' },
+        { status: 404 }
+      )
+    }
+
+    // Get label suggestions
+    const suggestions = await autoLabelCreationService.suggestLabels(
+      notebookId,
+      session.user.id,
+      language
+    )
+
+    if (!suggestions) {
+      return NextResponse.json({
+        success: true,
+        data: null,
+        message: 'No suggestions available (notebook may have fewer than 15 notes)',
+      })
+    }
+
+    return NextResponse.json({
+      success: true,
+      data: suggestions,
+    })
+  } catch (error) {
+    return NextResponse.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Failed to get label suggestions',
+      },
+      { status: 500 }
+    )
+  }
+}
+
+/**
+ * PUT /api/ai/auto-labels - Create suggested labels
+ */
+export async function PUT(request: NextRequest) {
+  try {
+    const session = await auth()
+
+    if (!session?.user?.id) {
+      return NextResponse.json(
+        { success: false, error: 'Unauthorized' },
+        { status: 401 }
+      )
+    }
+
+    const body = await request.json()
+    const { suggestions, selectedLabels } = body
+
+    if (!suggestions || !Array.isArray(selectedLabels)) {
+      return NextResponse.json(
+        { success: false, error: 'Missing required fields: suggestions, selectedLabels' },
+        { status: 400 }
+      )
+    }
+
+    // Create labels
+    const createdCount = await autoLabelCreationService.createLabels(
+      suggestions.notebookId,
+      session.user.id,
+      suggestions,
+      selectedLabels
+    )
+
+    return NextResponse.json({
+      success: true,
+      data: {
+        createdCount,
+      },
+    })
+  } catch (error) {
+    return NextResponse.json(
+      {
+        success: false,
+        error: error instanceof Error ? error.message : 'Failed to create labels',
+      },
+      { status: 500 }
+    )
+  }
+}