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/delete-all/route.ts

@@ -0,0 +1,53 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { prisma } from '@/lib/prisma'
+import { revalidatePath } from 'next/cache'
+
+export async function POST(req: NextRequest) {
+  try {
+    // Check authentication
+    const session = await auth()
+    if (!session?.user?.id) {
+      return NextResponse.json(
+        { success: false, error: 'Unauthorized' },
+        { status: 401 }
+      )
+    }
+
+    // Delete all notes for the user (cascade will handle labels-note relationships)
+    const result = await prisma.note.deleteMany({
+      where: {
+        userId: session.user.id
+      }
+    })
+
+    // Delete all labels for the user
+    await prisma.label.deleteMany({
+      where: {
+        userId: session.user.id
+      }
+    })
+
+    // Delete all notebooks for the user
+    await prisma.notebook.deleteMany({
+      where: {
+        userId: session.user.id
+      }
+    })
+
+    // Revalidate paths
+    revalidatePath('/')
+    revalidatePath('/settings/data')
+
+    return NextResponse.json({
+      success: true,
+      deletedNotes: result.count
+    })
+  } catch (error) {
+    console.error('Delete all error:', error)
+    return NextResponse.json(
+      { success: false, error: 'Failed to delete notes' },
+      { status: 500 }
+    )
+  }
+}