feat: add Koa2 BFF server, CLI management, sessions CLI integration, and logs page

- Add Koa2 BFF layer for API proxy, file upload, session management
- Auto-check and enable api_server in ~/.hermes/config.yaml on startup
- Integrate sessions with Hermes CLI (list, get, delete)
- Add Logs page with level filtering, log file selection, and search
- Add CLI commands: start/stop/restart/status for daemon management
- Unify package.json for frontend and server dependencies
- Default port changed to 8648

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -10,8 +10,14 @@ package-lock.json
 node_modules
 dist
 dist-ssr
+server/dist
 *.local
 
+# Server data
+server/data/
+server/node_modules/
+.hermes-web-ui/
+
 # Editor directories and files
 .vscode/*
 !.vscode/extensions.json