refactor(arch): move auth schemas to tenancy module and add cross-module service methods

Move all auth schemas (UserContext, UserLogin, LoginResponse, etc.) from
legacy models/schema/auth.py to app/modules/tenancy/schemas/auth.py per
MOD-019. Update 84 import sites across 14 modules. Legacy file now
re-exports for backwards compatibility.

Add missing tenancy service methods for cross-module consumers:
- merchant_service.get_merchant_by_owner_id()
- merchant_service.get_merchant_count_for_owner()
- admin_service.get_user_by_id() (public, was private-only)
- platform_service.get_active_store_count()

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/core/routes/api/admin_dashboard.py

@@ -31,7 +31,7 @@ from app.modules.core.schemas.dashboard import (
 )
 from app.modules.core.services.stats_aggregator import stats_aggregator
 from app.modules.core.services.widget_aggregator import widget_aggregator
-from models.schema.auth import UserContext
+from app.modules.tenancy.schemas.auth import UserContext
 
 admin_dashboard_router = APIRouter(prefix="/dashboard")
 logger = logging.getLogger(__name__)

app/modules/core/routes/api/admin_menu_config.py

@@ -29,9 +29,9 @@ from app.api.deps import (
 )
 from app.modules.core.services.menu_service import MenuItemConfig, menu_service
 from app.modules.enums import FrontendType  # API-007 - Enum for type safety
+from app.modules.tenancy.schemas.auth import UserContext
 from app.modules.tenancy.services.platform_service import platform_service
 from app.utils.i18n import DEFAULT_LANGUAGE, translate
-from models.schema.auth import UserContext
 
 logger = logging.getLogger(__name__)
 router = APIRouter(prefix="/menu-config")

app/modules/core/routes/api/admin_settings.py

@@ -32,7 +32,7 @@ from app.modules.tenancy.schemas.admin import (
     RowsPerPageResponse,
     RowsPerPageUpdateResponse,
 )
-from models.schema.auth import UserContext
+from app.modules.tenancy.schemas.auth import UserContext
 
 admin_settings_router = APIRouter(prefix="/settings")
 logger = logging.getLogger(__name__)

app/modules/core/routes/api/merchant_menu.py

@@ -20,8 +20,8 @@ from sqlalchemy.orm import Session
 from app.api.deps import get_current_merchant_from_cookie_or_header, get_db
 from app.modules.core.services.menu_service import menu_service
 from app.modules.enums import FrontendType
+from app.modules.tenancy.schemas.auth import UserContext
 from app.utils.i18n import translate
-from models.schema.auth import UserContext
 
 logger = logging.getLogger(__name__)
 

app/modules/core/routes/api/store_dashboard.py

@@ -26,8 +26,8 @@ from app.modules.core.schemas.dashboard import (
 )
 from app.modules.core.services.stats_aggregator import stats_aggregator
 from app.modules.tenancy.exceptions import StoreNotActiveException
+from app.modules.tenancy.schemas.auth import UserContext
 from app.modules.tenancy.services.store_service import store_service
-from models.schema.auth import UserContext
 
 store_dashboard_router = APIRouter(prefix="/dashboard")
 logger = logging.getLogger(__name__)

app/modules/core/routes/api/store_menu.py

@@ -21,9 +21,9 @@ from app.api.deps import get_current_store_api, get_user_permissions
 from app.core.database import get_db
 from app.modules.core.services.menu_service import menu_service
 from app.modules.enums import FrontendType
+from app.modules.tenancy.schemas.auth import UserContext
 from app.modules.tenancy.services.store_service import store_service
 from app.utils.i18n import translate
-from models.schema.auth import UserContext
 
 logger = logging.getLogger(__name__)
 

app/modules/core/routes/api/store_settings.py

@@ -17,8 +17,8 @@ from app.core.database import get_db
 from app.modules.core.services.platform_settings_service import (
     platform_settings_service,
 )
+from app.modules.tenancy.schemas.auth import UserContext
 from app.modules.tenancy.services.store_service import store_service
-from models.schema.auth import UserContext
 
 store_settings_router = APIRouter(prefix="/settings")
 logger = logging.getLogger(__name__)

app/modules/core/routes/pages/merchant.py

@@ -22,8 +22,8 @@ from app.api.deps import (
 )
 from app.modules.core.utils.page_context import get_context_for_frontend
 from app.modules.enums import FrontendType
+from app.modules.tenancy.schemas.auth import UserContext
 from app.templates_config import templates
-from models.schema.auth import UserContext
 
 ROUTE_CONFIG = {
     "prefix": "",

app/modules/core/services/auth_service.py

@@ -23,8 +23,8 @@ from app.modules.tenancy.exceptions import (
     UserNotActiveException,
 )
 from app.modules.tenancy.models import Store, StoreUser, User
+from app.modules.tenancy.schemas.auth import UserLogin
 from middleware.auth import AuthManager
-from models.schema.auth import UserLogin
 
 logger = logging.getLogger(__name__)
 

app/modules/core/tests/integration/test_merchant_dashboard_routes.py

@@ -19,8 +19,8 @@ from app.modules.billing.models import (
 )
 from app.modules.customers.models.customer import Customer
 from app.modules.tenancy.models import Merchant, Platform, Store, StoreUser, User
+from app.modules.tenancy.schemas.auth import UserContext
 from main import app
-from models.schema.auth import UserContext
 
 # ============================================================================
 # Fixtures

app/modules/core/tests/integration/test_merchant_menu_routes.py

@@ -26,8 +26,8 @@ from app.modules.billing.models import (
 )
 from app.modules.tenancy.models import Merchant, Platform, User
 from app.modules.tenancy.models.platform_module import PlatformModule
+from app.modules.tenancy.schemas.auth import UserContext
 from main import app
-from models.schema.auth import UserContext
 
 # ============================================================================
 # Fixtures

app/modules/core/tests/integration/test_store_dashboard_routes.py

@@ -19,8 +19,8 @@ import pytest
 from app.api.deps import get_current_store_from_cookie_or_header
 from app.modules.tenancy.models import Merchant, Platform, Store, User
 from app.modules.tenancy.models.store_platform import StorePlatform
+from app.modules.tenancy.schemas.auth import UserContext
 from main import app
-from models.schema.auth import UserContext
 
 # ============================================================================
 # Fixtures