Add missing app files and fix Docker configuration

- Add all PHP app files (controllers, middleware, providers, models, enums)
  that were previously gitignored via app/.gitignore wildcard
- Fix app/.gitignore to no longer ignore all files
- Fix docker-compose.yml: use named volume for postgres to avoid chown permission errors on server
- Fix Dockerfile: use --classmap-authoritative for composer dump-autoload

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Http/Controllers/Auth/LoginController.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Controllers\Auth;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Foundation\Auth\AuthenticatesUsers;
+
+class LoginController extends Controller
+{
+    use AuthenticatesUsers;
+
+    protected $redirectTo = '/';
+
+    public function __construct()
+    {
+        $this->middleware('guest')->except('logout');
+    }
+
+    public function username()
+    {
+        return 'phone';
+    }
+}