Add migration to include site_name column in cities table

docs/api/location.md

@@ -177,6 +177,7 @@ Create a new city.
 ```json
 {
   "name": "تهران",
+  "site_name": "تهران نوبت",
   "province_id": 1,
   "status": "active",
   "weight": 1
@@ -186,9 +187,11 @@ Create a new city.
 | Field | Type | Required | Description |
 |-------|------|----------|-------------|
 | `name` | string | ✅ | City name |
+| `site_name` | string | ❌ | Public site name shown on the city's booking website (e.g. `"یزد نوبت"`) |
 | `province_id` | integer | ❌ | Parent province ID |
 | `status` | string | ❌ | `"active"` or `"inactive"` |
 | `weight` | integer | ❌ | Sort weight |
+| `contact_phone`, `email`, `description`, `slogan`, `domain`, `keywords`, `footer_description`, `social_media`, `logo_url` | mixed | ❌ | SEO / branding fields returned in the city object |
 
 ### Response `201`
 City object.