feat(v5): add Inertia app shell with Flux health

Adds v5 routing, middleware, home page rendering, team context sharing,
project model/table support, and Flux health reporting. Installs Flux in
container builds with role-aware s6 services and documents runtime roles.

config/flux.php

@@ -0,0 +1,6 @@
+<?php
+
+return [
+    'unix_socket_path' => env('COOLIFY_FLUX_UNIX_SOCKET_PATH', '/run/coolify/flux.sock'),
+    'health_timeout_seconds' => (float) env('COOLIFY_FLUX_HEALTH_TIMEOUT_SECONDS', 1.0),
+];