Refactor application ports to 12000 for backend and 12001 for frontend; update documentation and configuration files accordingly

Co-authored-by: Copilot <copilot@github.com>

README.md

@@ -49,7 +49,7 @@ uvicorn app.main:app --reload --port 12000
 
 ```bash
 cd frontend
-flask --app app.main run --port 5000
+flask --app app.main run --port 12001
 ```
 
 ### Running tests