feat: add demand page modules and admin endpoints

Add full backend support for a demand request page, including:
- New database models for demand hero, feature cards, form configuration, and product recommendations
- Alembic migration for the new tables
- Default seed data for demand page components
- Public site config endpoint exposing demand data
- Admin CRUD operations and configuration for demand modules
- Extended lead query filters for source page, keyword, and date range
- Updated Pydantic schemas for lead query parameters
- Comprehensive test coverage for all new endpoints

app/routers/shared.py

@@ -1,6 +1,7 @@
 from sqlalchemy import select
 from sqlalchemy.orm import Session, selectinload
-from ..models import Campaign, CtaBanner, Destination, DestinationHero, DestinationRegion, HeroSlide, HotelGroup, MapImage, ThemeCard, VehicleOption
+from ..models import Campaign, CtaBanner, DemandFeatureCard, DemandForm, DemandHero, Destination, DestinationHero, DestinationRegion, HeroSlide, HotelGroup, MapImage, ThemeCard, VehicleOption
+from ..demand_recommendations import demand_recommendation_dict, demand_recommendation_query
 from ..route_sections import route_section_dict, route_section_query
 from ..serializers import destination_dict, hotel_group_dict, model_dict
 
@@ -15,6 +16,9 @@ def site_config(db: Session, active_only: bool, include_public_extras: bool = Tr
     cta_stmt = select(CtaBanner).order_by(CtaBanner.sortOrder.asc())
     hotel_stmt = select(HotelGroup).order_by(HotelGroup.sortOrder.asc())
     vehicle_stmt = select(VehicleOption).order_by(VehicleOption.sortOrder.asc())
+    demand_hero_stmt = select(DemandHero).order_by(DemandHero.sortOrder.asc())
+    demand_feature_card_stmt = select(DemandFeatureCard).order_by(DemandFeatureCard.sortOrder.asc())
+    demand_form_stmt = select(DemandForm).order_by(DemandForm.createdAt.asc())
     if active_only:
         hero_stmt = hero_stmt.where(HeroSlide.isActive.is_(True))
         destination_stmt = destination_stmt.where(Destination.isActive.is_(True))
@@ -25,6 +29,9 @@ def site_config(db: Session, active_only: bool, include_public_extras: bool = Tr
         cta_stmt = cta_stmt.where(CtaBanner.isActive.is_(True))
         hotel_stmt = hotel_stmt.where(HotelGroup.isActive.is_(True), HotelGroup.status == "published")
         vehicle_stmt = vehicle_stmt.where(VehicleOption.isActive.is_(True))
+        demand_hero_stmt = demand_hero_stmt.where(DemandHero.isActive.is_(True))
+        demand_feature_card_stmt = demand_feature_card_stmt.where(DemandFeatureCard.isActive.is_(True))
+        demand_form_stmt = demand_form_stmt.where(DemandForm.isActive.is_(True))
 
     hero_slides = db.scalars(hero_stmt).all()
     destinations = db.scalars(destination_stmt).all()
@@ -51,4 +58,11 @@ def site_config(db: Session, active_only: bool, include_public_extras: bool = Tr
         result["routeSections"] = [route_section_dict(item, public=True) for item in route_sections]
         result["hotelGroups"] = [hotel_group_dict(item) for item in db.scalars(hotel_stmt).all()]
         result["vehicleOptions"] = [model_dict(item) for item in db.scalars(vehicle_stmt).all()]
+    result["demandHero"] = [model_dict(item) for item in db.scalars(demand_hero_stmt).all()]
+    result["demandFeatureCards"] = [model_dict(item) for item in db.scalars(demand_feature_card_stmt).all()]
+    result["demandForm"] = [model_dict(item) for item in db.scalars(demand_form_stmt).all()]
+    demand_recommendations = db.scalars(demand_recommendation_query()).all()
+    if active_only:
+        demand_recommendations = [item for item in demand_recommendations if item.isActive]
+    result["demandRecommendations"] = [demand_recommendation_dict(item, public=active_only) for item in demand_recommendations]
     return result