feat: add destination page configurable modules

This commit adds full support for two new destination page modules: a hero banner section and categorized destination regions.

Changes include:
- New SQLAlchemy models and alembic migration for DestinationHero and DestinationRegion tables
- Updated Pydantic SiteConfigPatchIn schema with new optional fields
- Integrated admin CRUD support for the new modules
- Added default seed data for Guizhou destination regions and hero content
- Exposed active modules via public site config API
- Added comprehensive test coverage for admin and public endpoints

app/routers/admin.py

@@ -19,6 +19,8 @@ from ..models import (
     Campaign,
     CtaBanner,
     Destination,
+    DestinationHero,
+    DestinationRegion,
     HeroSlide,
     HotelGroup,
     Lead,
@@ -68,6 +70,24 @@ SITE_CONFIG_MODULES = {
         "none_to_empty": set(),
         "create_defaults": {"isHot": False},
     },
+    "destinationHero": {
+        "model": DestinationHero,
+        "entity": "destination_hero",
+        "primary": "title",
+        "fields": {"title", "kicker", "image", "isActive", "sortOrder"},
+        "none_to_empty": set(),
+        "empty_to_none": {"kicker", "image"},
+        "create_defaults": {"kicker": None, "image": None},
+    },
+    "destinationRegions": {
+        "model": DestinationRegion,
+        "entity": "destination_region",
+        "primary": "label",
+        "fields": {"label", "keyword", "spots", "isActive", "sortOrder"},
+        "none_to_empty": set(),
+        "empty_to_none": {"keyword", "spots"},
+        "create_defaults": {"keyword": None, "spots": None},
+    },
     "map": {
         "model": MapImage,
         "entity": "map_image",
@@ -655,6 +675,14 @@ def admin_site_config(_user: AdminUser = Depends(require_admin), db: Session = D
             for item in db.scalars(select(HeroSlide).order_by(HeroSlide.sortOrder.asc())).all()
         ],
         "destinations": [destination_dict(item) for item in destinations],
+        "destinationHero": [
+            model_dict(item)
+            for item in db.scalars(select(DestinationHero).order_by(DestinationHero.sortOrder.asc())).all()
+        ],
+        "destinationRegions": [
+            model_dict(item)
+            for item in db.scalars(select(DestinationRegion).order_by(DestinationRegion.sortOrder.asc())).all()
+        ],
         "map": [
             map_image_admin_dict(item)
             for item in db.scalars(select(MapImage).order_by(MapImage.createdAt.asc())).all()