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/notes/export/route.ts

@@ -0,0 +1,121 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { prisma } from '@/lib/prisma'
+
+export async function GET(req: NextRequest) {
+  try {
+    // Check authentication
+    const session = await auth()
+    if (!session?.user?.id) {
+      return NextResponse.json(
+        { success: false, error: 'Unauthorized' },
+        { status: 401 }
+      )
+    }
+
+    // Fetch all notes with related data
+    const notes = await prisma.note.findMany({
+      where: {
+        userId: session.user.id
+      },
+      include: {
+        labels: {
+          select: {
+            id: true,
+            name: true
+          }
+        },
+        notebook: {
+          select: {
+            id: true,
+            name: true
+          }
+        }
+      },
+      orderBy: {
+        createdAt: 'desc'
+      }
+    })
+
+    // Fetch labels separately
+    const labels = await prisma.label.findMany({
+      where: {
+        userId: session.user.id
+      },
+      include: {
+        notes: {
+          select: {
+            id: true
+          }
+        }
+      }
+    })
+
+    // Fetch notebooks
+    const notebooks = await prisma.notebook.findMany({
+      where: {
+        userId: session.user.id
+      },
+      include: {
+        notes: {
+          select: {
+            id: true
+          }
+        }
+      }
+    })
+
+    // Create export object
+    const exportData = {
+      version: '1.0.0',
+      exportDate: new Date().toISOString(),
+      user: {
+        id: session.user.id,
+        email: session.user.email,
+        name: session.user.name
+      },
+      data: {
+        labels: labels.map(label => ({
+          id: label.id,
+          name: label.name,
+          color: label.color,
+          noteCount: label.notes.length
+        })),
+        notebooks: notebooks.map(notebook => ({
+          id: notebook.id,
+          name: notebook.name,
+          description: notebook.description,
+          noteCount: notebook.notes.length
+        })),
+        notes: notes.map(note => ({
+          id: note.id,
+          title: note.title,
+          content: note.content,
+          createdAt: note.createdAt,
+          updatedAt: note.updatedAt,
+          isPinned: note.isPinned,
+          notebookId: note.notebookId,
+          labels: note.labels.map(label => ({
+            id: label.id,
+            name: label.name
+          }))
+        }))
+      }
+    }
+
+    // Return as JSON file
+    const jsonString = JSON.stringify(exportData, null, 2)
+    return new NextResponse(jsonString, {
+      headers: {
+        'Content-Type': 'application/json',
+        'Content-Disposition': `attachment; filename="memento-export-${new Date().toISOString().split('T')[0]}.json"`
+      }
+    })
+  } catch (error) {
+    console.error('Export error:', error)
+    return NextResponse.json(
+      { success: false, error: 'Failed to export notes' },
+      { status: 500 }
+    )
+  }
+}