Fix nginx proxy port (3001), add nginx.conf to Dockerfile, add /ws proxy, fix WebSocketProvider for production URLs

frontend/Dockerfile

@@ -9,5 +9,6 @@ RUN npm run build
 # Production stage
 FROM nginx:alpine
 COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]

frontend/nginx.conf

@@ -12,7 +12,20 @@ server {
 
     # Proxy API requests to backend
     location /api/ {
-        proxy_pass http://backend:5000;
+        proxy_pass http://backend:3001;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    # Proxy WebSocket requests to backend
+    location /ws/ {
+        proxy_pass http://backend:3001;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';

frontend/src/crdt/WebSocketProvider.ts

@@ -5,7 +5,8 @@ export class WebSocketProvider {
   provider: WebsocketProvider;
   
   constructor(doc: Y.Doc, projectId: string, jwtToken: string) {
-    const url = `ws://localhost:3001/project:${projectId}`;
+    const proto = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+    const url = `${proto}//${window.location.host}/ws/collab`;
     this.provider = new WebsocketProvider(url, `project:${projectId}`, doc, {
       params: { token: jwtToken }
     });