Switched back from SQLite to PostgreSQL configuration to reconnect
to the existing PostgreSQL database with user data.
Changes:
- Renamed database.js to database-sqlite.js (SQLite backup config)
- Renamed database-postgres.js to database.js (PostgreSQL primary)
- Created .env file with PostgreSQL connection settings (not committed)
The backend now expects PostgreSQL on localhost:5499. To start the
database, run: docker-compose up -d postgres
Note: This resolves the empty notes issue - once PostgreSQL is started,
all user notes will be loaded from the PostgreSQL database.
