Refactor Docker setup and remove unused files

- Updated docker-compose.yml to rename backend and frontend container names for clarity.
- Added volume mappings for frontend and backend services to persist data.
- Removed obsolete files related to frequency response extraction, including Python scripts and output data files.
- Adjusted backend port configuration in main.py to align with new service architecture.
- Enhanced logging for file upload paths in models.py for better traceability.

frontend/nginx.conf

@@ -8,7 +8,7 @@ server {
     gzip on;
     gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
 
-    # API proxy to backend
+    # API proxy to backend (使用后端容器名和端口)
     location /api {
         proxy_pass http://backend:8000;
         proxy_set_header Host $host;