Fix: tambah instruksi untuk jalankan backend dengan router.php

SETUP_LOCAL.md

@@ -34,12 +34,21 @@ http://localhost/index.html
 
 ### Opsi 3: Gunakan PHP Built-in Server
 
+**Frontend:**
 ```bash
 cd "C:\laragon\www\RETRIBUSI_BAPENDA\retribusi (frontend)\public"
 php -S localhost:8080
 ```
 
-Akses: `http://localhost:8080/index.html`
+**Backend API (PENTING - harus dengan router.php):**
+```bash
+cd "C:\laragon\www\RETRIBUSI_BAPENDA\api-btekno\public"
+php -S localhost:8000 router.php
+```
+
+**Akses:**
+- Frontend: `http://localhost:8080/index.html`
+- Backend API: `http://localhost:8000` (dengan router.php)
 
 ## Konfigurasi API