- Changed the build process to include a web UI build stage using Node.js.
- Updated Go build stage to copy web UI files to the correct location.
- Removed the main.go file as it is no longer needed.
- Added SQLite database configuration to example config.
- Updated dependencies in go.mod and go.sum, including new packages for JWT and SQLite.
- Modified .gitignore to include new database and configuration files.
Signed-off-by: zhenyus <zhenyus@mathmast.com>