fix(dev): evita problemi IPv6 di localhost su ws e proxy controller

Usa fallback a 127.0.0.1 quando l'hostname è localhost/::1 nei client websocket display/controller.

Instrada il proxy del controller dev verso Vite tramite DEV_PROXY_HOST (default 127.0.0.1).

Mostra gli URL locali del server con 127.0.0.1 per una diagnostica coerente su Raspberry/Linux.

src/components/ControllerPage.vue

@@ -312,7 +312,12 @@ export default {
       // Permette di specificare un host WebSocket alternativo via query parameter
       // Utile per scenari WSL2 o development remoto: ?wsHost=192.168.1.100:3001
       const params = new URLSearchParams(location.search)
-      const wsHost = params.get('wsHost') || location.host
+      const defaultHost = (
+        location.hostname === 'localhost' || location.hostname === '::1'
+      )
+        ? `127.0.0.1${location.port ? `:${location.port}` : ''}`
+        : location.host
+      const wsHost = params.get('wsHost') || defaultHost
       const wsUrl = `${protocol}//${wsHost}/ws`
 
       console.log('[Controller] Connecting to WebSocket:', wsUrl)