feat: add hotel and vehicle option site modules

Add full support for hotel group and vehicle option site management features:
- Define SQLAlchemy models and alembic migration for the new database tables
- Add default sample content entries in content.py
- Extend admin and public API routes to support the new modules
- Update seed script to populate default hotel and vehicle data
- Update all relevant documentation and test cases

alembic/versions/0005_hotel_vehicle_modules.py

@@ -0,0 +1,49 @@
+"""Add hotel and vehicle site modules.
+
+Revision ID: 0005_hotel_vehicle_modules
+Revises: 0004_route_sections
+Create Date: 2026-07-03
+"""
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import inspect
+
+
+revision = "0005_hotel_vehicle_modules"
+down_revision = "0004_route_sections"
+branch_labels = None
+depends_on = None
+
+
+def _create_card_table(table_name: str) -> None:
+    op.create_table(
+        table_name,
+        sa.Column("id", sa.String(), nullable=False),
+        sa.Column("title", sa.String(), nullable=False),
+        sa.Column("description", sa.Text(), 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 upgrade() -> None:
+    bind = op.get_bind()
+    existing_tables = set(inspect(bind).get_table_names())
+    if "HotelGroup" not in existing_tables:
+        _create_card_table("HotelGroup")
+    if "VehicleOption" not in existing_tables:
+        _create_card_table("VehicleOption")
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    existing_tables = set(inspect(bind).get_table_names())
+    if "VehicleOption" in existing_tables:
+        op.drop_table("VehicleOption")
+    if "HotelGroup" in existing_tables:
+        op.drop_table("HotelGroup")