refactor: replace better-sqlite3 with lowdb for request details storage

- Removed better-sqlite3 dependency and implemented lowdb for JSON-based storage.
- Updated observability settings handling and configuration retrieval.
- Cleaned up unused observability settings UI components in ProfilePage.
- Adjusted contributors badge display in README for better visibility.

package.json

@@ -15,7 +15,6 @@
     "@monaco-editor/react": "^4.7.0",
     "@xyflow/react": "^12.10.1",
     "bcryptjs": "^3.0.3",
-    "better-sqlite3": "^12.6.2",
     "express": "^5.2.1",
     "fs": "^0.0.1-security",
     "http-proxy-middleware": "^3.0.5",