docs: Add module guide dan security guidelines untuk API documentation

MODULE_GUIDE.md

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+# Panduan Menambah Module Baru
+
+## 📦 Struktur Module
+
+Setiap module baru mengikuti pola yang sama:
+
+```
+src/Modules/ModuleBaru/
+ ├── ModuleBaruRoutes.php    # Register routes
+ ├── Controller.php           # Request handler
+ └── Service.php              # Business logic
+```
+
+## 🚀 Langkah Menambah Module
+
+### 1. Buat Struktur Folder
+
+```bash
+mkdir -p src/Modules/ModuleBaru
+```
+
+### 2. Buat Routes File
+
+`src/Modules/ModuleBaru/ModuleBaruRoutes.php`:
+
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace App\Modules\ModuleBaru;
+
+use Slim\App;
+
+class ModuleBaruRoutes
+{
+    public static function register(App $app): void
+    {
+        $app->group('/modulebaru', function ($group) {
+            $group->group('/v1', function ($v1Group) {
+                // Routes di sini
+                $v1Group->get('/endpoint', [Controller::class, 'method']);
+            });
+        });
+    }
+}
+```
+
+### 3. Register di public/index.php
+
+Tambahkan di bagian "Register module routes":
+
+```php
+use App\Modules\ModuleBaru\ModuleBaruRoutes;
+
+// ...
+
+// Register module routes
+HealthRoutes::register($app);
+AuthRoutes::register($app);
+RetribusiRoutes::register($app);
+ModuleBaruRoutes::register($app);  // <-- Tambahkan di sini
+```
+
+### 4. Update OpenAPI Spec (Opsional)
+
+Edit `public/docs/openapi.json` dan tambahkan endpoint baru di `paths`.
+
+## ✅ Contoh: Module "Parkir"
+
+```php
+// src/Modules/Parkir/ParkirRoutes.php
+namespace App\Modules\Parkir;
+
+use App\Middleware\JwtMiddleware;
+use Slim\App;
+
+class ParkirRoutes
+{
+    public static function register(App $app): void
+    {
+        $jwtMiddleware = new JwtMiddleware();
+        
+        $app->group('/parkir', function ($group) use ($jwtMiddleware) {
+            $group->group('/v1', function ($v1Group) use ($jwtMiddleware) {
+                $v1Group->get('/zones', [ParkirController::class, 'getZones'])
+                    ->add($jwtMiddleware);
+            });
+        });
+    }
+}
+```
+
+## 🔄 Best Practices
+
+1. **Isolasi**: Setiap module independen
+2. **Naming**: Gunakan namespace yang jelas
+3. **Routes**: Group by module name
+4. **Versioning**: Gunakan `/v1` untuk future compatibility
+5. **Middleware**: Apply di level group atau route
+
+## 📝 Checklist Module Baru
+
+- [ ] Buat folder `src/Modules/ModuleName/`
+- [ ] Buat `ModuleNameRoutes.php` dengan method `register()`
+- [ ] Buat Controller & Service (jika perlu)
+- [ ] Register di `public/index.php`
+- [ ] Test routes
+- [ ] Update OpenAPI spec (opsional)
+- [ ] Commit & push
+