feat: add interactive terminal support for containers via WebSocket

- Implemented WebSocket endpoint for executing interactive shells in Docker containers.
- Added ticket-based authentication for terminal access to enhance security.
- Updated frontend to support terminal interactions, including lazy loading of terminal components.
- Enhanced backend to manage terminal session tickets and settings for enabling/disabling terminal access.
- Updated Nginx configuration to support WebSocket connections for terminal sessions.
- Added necessary dependencies for terminal functionality in the frontend.
- Improved user interface to include terminal access controls and feedback on terminal status.

vps-monitor/frontend/nginx.conf

@@ -1,3 +1,10 @@
+# Bascule l'en-tête Connection selon qu'il s'agit d'un WebSocket ou non —
+# nécessaire pour le terminal des conteneurs, qui passe par /api/….
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    ''      close;
+}
+
 server {
     listen 80;
     root /usr/share/nginx/html;
@@ -8,6 +15,16 @@ server {
         proxy_pass         http://backend:8000;
         proxy_set_header   Host $host;
         proxy_set_header   X-Real-IP $remote_addr;
+
+        # Relais WebSocket (terminal interactif)
+        proxy_http_version 1.1;
+        proxy_set_header   Upgrade $http_upgrade;
+        proxy_set_header   Connection $connection_upgrade;
+
+        # Un terminal ouvert peut rester inactif longtemps sans être coupé
+        proxy_read_timeout 3600s;
+        proxy_send_timeout 3600s;
+        proxy_buffering    off;
     }
 
     # SPA fallback