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>

mcp-server/index-sse.js

@@ -88,14 +88,8 @@ app.use((req, res, next) => {
   next();
 });
 
-// Initialize Prisma Client with correct database path
-const prisma = new PrismaClient({
-  datasources: {
-    db: {
-      url: 'file:D:/dev_new_pc/Keep/keep-notes/prisma/dev.db'
-    }
-  }
-});
+// Initialize Prisma Client
+const prisma = new PrismaClient();
 
 // Helper to parse JSON fields
 function parseNote(dbNote) {
@@ -141,7 +135,7 @@ function parseNoteLightweight(dbNote) {
 // Create MCP server
 const server = new Server(
   {
-    name: 'keep-notes-mcp-server',
+    name: 'memento-mcp-server',
     version: '2.0.0',
   },
   {
@@ -1357,7 +1351,7 @@ app.listen(PORT, '0.0.0.0', () => {
    20. update_label      - Update label
    21. delete_label      - Delete label
 
-📋 Database: D:/dev_new_pc/Keep/keep-notes/prisma/dev.db
+📋 Database: PostgreSQL (via DATABASE_URL env var)
 
 🌐 For N8N configuration:
    Use SSE endpoint: http://YOUR_IP:${PORT}/sse