Rename controller namespaces: drop V1 prefix, clarify roles

V1/Admin     -> Company       (company-scoped controllers)
V1/SuperAdmin -> Admin        (platform-wide admin controllers)
V1/Customer  -> CustomerPortal (customer-facing portal)
V1/Installation -> Setup      (installation wizard)
V1/PDF       -> Pdf           (consistent casing)
V1/Modules   -> Modules       (drop V1 prefix)
V1/Webhook   -> Webhook       (drop V1 prefix)

The V1 prefix served no purpose - API versioning is in the route prefix
(/api/v1/), not the controller namespace. "Admin" was misleading for
company-scoped controllers. "SuperAdmin" is now simply "Admin" for
platform administration.

app/Http/Controllers/Setup/AppDomainController.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Controllers\Setup;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\DomainEnvironmentRequest;
+use App\Services\Installation\EnvironmentManager;
+use Illuminate\Support\Facades\Artisan;
+
+class AppDomainController extends Controller
+{
+    public function __invoke(DomainEnvironmentRequest $request)
+    {
+        Artisan::call('optimize:clear');
+
+        $environmentManager = new EnvironmentManager;
+
+        $results = $environmentManager->saveDomainVariables($request);
+
+        if (in_array('error', $results)) {
+            return response()->json($results);
+        }
+
+        return response()->json([
+            'success' => true,
+        ]);
+    }
+}