Add deployment documentation and enhance project setup scripts

- Introduced `DEPLOYMENT.md` for comprehensive deployment instructions.
- Added `start.bat` and `start.sh` scripts for unified project startup on Windows and Linux/Mac.
- Updated `.gitignore` to exclude additional files and directories.
- Enhanced `main.py` to serve static frontend files and handle SPA routing.
- Configured Vite to output the frontend build to the backend public directory.
- Minor adjustments in `ReviewDetail.tsx` for improved data handling.

.gitignore

@@ -27,6 +27,10 @@ env/
 
 # Database
 *.db
+*.db-journal
+
+# Frontend build
+backend/public/
 *.sqlite
 *.sqlite3