Add a stage branch deploy beside production on z00.

Pushing stage runs CI and deploys to stage.transcribe.z00.nu with its own data, Reverb credentials, and Caddy network.

config/reverb.php

@@ -15,6 +15,24 @@ return [
 
     'default' => env('REVERB_SERVER', 'reverb'),
 
+    /*
+    |--------------------------------------------------------------------------
+    | Browser (Echo) connection
+    |--------------------------------------------------------------------------
+    |
+    | Public WebSocket host/key rendered into HTML so one image can serve
+    | production and staging. Server-side publish still uses REVERB_HOST
+    | (Docker DNS "reverb" behind the z00 overlay).
+    |
+    */
+
+    'client' => [
+        'key' => env('REVERB_APP_KEY'),
+        'host' => env('REVERB_PUBLIC_HOST', env('REVERB_HOST')),
+        'port' => env('REVERB_PUBLIC_PORT', env('REVERB_PORT', 443)),
+        'scheme' => env('REVERB_PUBLIC_SCHEME', env('REVERB_SCHEME', 'https')),
+    ],
+
     /*
     |--------------------------------------------------------------------------
     | Reverb Servers