🔧(frontend) make app title customizable with env variable override

Replace default "visio" with "LaSuite Meet" and allow env variable
customization. Default Docker image uses "LaSuite Meet", but deployments
can override with custom values by setting env vars and rebuilding.

compose.yml

@@ -138,6 +138,7 @@ services:
       target: frontend-production
       args:
         VITE_API_BASE_URL: "http://localhost:8071"
+        VITE_APP_TITLE: "LaSuite Meet"
     image: meet:frontend-development
     ports:
       - "3000:8080"