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

alembic/versions/0007_destination_page_modules.py

@@ -0,0 +1,64 @@
+"""Add destination page configurable modules.
+
+Revision ID: 0007_destination_page_modules
+Revises: 0006_hotel_group_offer_fields
+Create Date: 2026-07-07
+"""
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import inspect
+
+
+revision = "0007_destination_page_modules"
+down_revision = "0006_hotel_group_offer_fields"
+branch_labels = None
+depends_on = None
+
+
+def _create_destination_hero_table() -> None:
+    op.create_table(
+        "DestinationHero",
+        sa.Column("id", sa.String(), nullable=False),
+        sa.Column("title", sa.String(), nullable=False),
+        sa.Column("kicker", sa.String(), nullable=True),
+        sa.Column("image", sa.String(), nullable=True),
+        sa.Column("sortOrder", sa.Integer(), nullable=False, server_default="0"),
+        sa.Column("isActive", sa.Boolean(), nullable=False, server_default=sa.true()),
+        sa.Column("createdAt", sa.DateTime(), nullable=False),
+        sa.Column("updatedAt", sa.DateTime(), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
+    )
+
+
+def _create_destination_region_table() -> None:
+    op.create_table(
+        "DestinationRegion",
+        sa.Column("id", sa.String(), nullable=False),
+        sa.Column("label", sa.String(), nullable=False),
+        sa.Column("keyword", sa.String(), nullable=True),
+        sa.Column("spots", sa.Text(), nullable=True),
+        sa.Column("sortOrder", sa.Integer(), nullable=False, server_default="0"),
+        sa.Column("isActive", sa.Boolean(), nullable=False, server_default=sa.true()),
+        sa.Column("createdAt", sa.DateTime(), nullable=False),
+        sa.Column("updatedAt", sa.DateTime(), nullable=False),
+        sa.PrimaryKeyConstraint("id"),
+    )
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+    existing_tables = set(inspect(bind).get_table_names())
+    if "DestinationHero" not in existing_tables:
+        _create_destination_hero_table()
+    if "DestinationRegion" not in existing_tables:
+        _create_destination_region_table()
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    existing_tables = set(inspect(bind).get_table_names())
+    if "DestinationRegion" in existing_tables:
+        op.drop_table("DestinationRegion")
+    if "DestinationHero" in existing_tables:
+        op.drop_table("DestinationHero")