feat: add test automation and backend startup scripts

SETUP.md

@@ -168,6 +168,34 @@ Backend en vivo: `https://your-railway-project.up.railway.app`
 
 ---
 
+## 6. Test Automatizado
+
+### Terminal 1: Correr backend
+```bash
+bash run_backend.sh
+```
+
+Esperar a:
+```
+Uvicorn running on http://127.0.0.1:8000
+```
+
+### Terminal 2: Correr test
+```bash
+bash test_demo.sh
+```
+
+**Output esperado:**
+```
+✓ Register OK
+✓ Create Address OK
+✓ Get ETA OK
+✓ Guide OK
+=== ALL TESTS PASSED ===
+```
+
+---
+
 ## Troubleshooting
 
 | Problema | Solución |