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/models.py

@@ -98,6 +98,32 @@ class MapImage(Base):
     updatedAt: Mapped[datetime] = mapped_column(DateTime, default=utc_now, onupdate=utc_now, nullable=False)
 
 
+class DestinationHero(Base):
+    __tablename__ = "DestinationHero"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True, default=new_id)
+    title: Mapped[str] = mapped_column(String, nullable=False)
+    kicker: Mapped[str | None] = mapped_column(String)
+    image: Mapped[str | None] = mapped_column(String)
+    sortOrder: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
+    isActive: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+    createdAt: Mapped[datetime] = mapped_column(DateTime, default=utc_now, nullable=False)
+    updatedAt: Mapped[datetime] = mapped_column(DateTime, default=utc_now, onupdate=utc_now, nullable=False)
+
+
+class DestinationRegion(Base):
+    __tablename__ = "DestinationRegion"
+
+    id: Mapped[str] = mapped_column(String, primary_key=True, default=new_id)
+    label: Mapped[str] = mapped_column(String, nullable=False)
+    keyword: Mapped[str | None] = mapped_column(String)
+    spots: Mapped[str | None] = mapped_column(Text)
+    sortOrder: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
+    isActive: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+    createdAt: Mapped[datetime] = mapped_column(DateTime, default=utc_now, nullable=False)
+    updatedAt: Mapped[datetime] = mapped_column(DateTime, default=utc_now, onupdate=utc_now, nullable=False)
+
+
 class ThemeCard(Base):
     __tablename__ = "ThemeCard"