fix: frontend-backend integration — 14 issues resolved

- nginx: add proxy routes for /settings/, /templates/, /ipam/, /logs/, /admin/, /health
- dashboard: fix data format mismatch (servers[] not nodes[]/vms[])
- dashboard: add WebSocket subscription to dashboard_metrics for real-time updates
- dashboard: connect activity feed to /logs/api/logs endpoint
- dashboard: reduce polling to 15s with WS as primary update source
- graphs: fix rrddata response unwrap (backend returns {data:[],timeframe:''})
- graphs: add i18n translations for chart titles
- console: add xterm.js CSS import for proper terminal rendering
- console: add i18n translations (connecting, reconnect)
- workspace: add switcher dropdown in TopBar
- workspace: add edit dialog in WorkspacesPage
- workspace: create Zustand store with localStorage persistence
- workspace: add X-Active-Workspace header to API client
- sidebar: replace generic icon with actual favicon.svg logo
- instances: translate RowActionMenu and InstanceDetailPage strings
- locales: add graphs, console, workspace, instance tab keys to en/ru

nginx/conf.d/serverpanel.conf.template

@@ -48,21 +48,31 @@ server {
     limit_req zone=general burst=20 nodelay;
     limit_conn addr 10;
 
-    # Proxy to FastAPI application
-    location / {
+    # Health check endpoint
+    location /health {
+        proxy_pass http://serverpanel-app:8000;
+        access_log off;
+    }
+
+    # API proxy
+    location /api/ {
+        limit_req zone=api burst=50 nodelay;
+        proxy_pass http://serverpanel-app:8000;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        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;
+    }
+
+    # Proxmox API proxy
+    location /proxmox/ {
         proxy_pass http://serverpanel-app:8000;
         proxy_http_version 1.1;
-        proxy_set_header Upgrade $http_upgrade;
-        proxy_set_header Connection 'upgrade';
         proxy_set_header Host $host;
         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_cache_bypass $http_upgrade;
-        
-        # Timeouts
-        proxy_connect_timeout 60s;
-        proxy_send_timeout 60s;
         proxy_read_timeout 60s;
     }
 
@@ -80,18 +90,7 @@ server {
         proxy_send_timeout 86400;
     }
 
-    # API rate limiting (stricter)
-    location /api/ {
-        limit_req zone=api burst=50 nodelay;
-        proxy_pass http://serverpanel-app:8000;
-        proxy_http_version 1.1;
-        proxy_set_header Host $host;
-        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;
-    }
-
-    # Static files caching
+    # Backend static files (legacy, logo, etc.)
     location /static/ {
         proxy_pass http://serverpanel-app:8000;
         proxy_cache_valid 200 1d;
@@ -99,9 +98,13 @@ server {
         add_header Cache-Control "public, immutable";
     }
 
-    # Health check endpoint
-    location /health {
-        proxy_pass http://serverpanel-app:8000;
-        access_log off;
+    # SPA frontend — all other routes
+    location / {
+        proxy_pass http://serverpanel-frontend:80;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        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;
     }
 }