refactor: move letzshop endpoints to marketplace module and add vendor service tests

Move letzshop-related functionality from tenancy to marketplace module:
- Move admin letzshop routes to marketplace/routes/api/admin_letzshop.py
- Move letzshop schemas to marketplace/schemas/letzshop.py
- Remove letzshop code from tenancy module (admin_vendors, vendor_service)
- Update model exports and imports

Add comprehensive unit tests for vendor services:
- test_company_service.py: Company management operations
- test_platform_service.py: Platform management operations
- test_vendor_domain_service.py: Vendor domain operations
- test_vendor_team_service.py: Vendor team management

Update module definitions:
- billing, messaging, payments: Minor definition updates

Add architecture proposals documentation:
- Module dependency redesign session notes
- Decouple modules implementation plan
- Module decoupling proposal

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/tenancy/schemas/__init__.py

@@ -21,9 +21,6 @@ from app.modules.tenancy.schemas.company import (
 
 # Vendor schemas
 from app.modules.tenancy.schemas.vendor import (
-    LetzshopExportFileInfo,
-    LetzshopExportRequest,
-    LetzshopExportResponse,
     VendorCreate,
     VendorCreateResponse,
     VendorDetailResponse,
@@ -125,9 +122,6 @@ __all__ = [
     "CompanyTransferOwnershipResponse",
     "CompanyUpdate",
     # Vendor
-    "LetzshopExportFileInfo",
-    "LetzshopExportRequest",
-    "LetzshopExportResponse",
     "VendorCreate",
     "VendorCreateResponse",
     "VendorDetailResponse",

app/modules/tenancy/schemas/vendor.py

@@ -312,40 +312,21 @@ class VendorSummary(BaseModel):
 # Ownership transfer is now handled at the Company level.
 # See models/schema/company.py for CompanyTransferOwnership and CompanyTransferOwnershipResponse.
 
-
-# ============================================================================
-# LETZSHOP EXPORT SCHEMAS
-# ============================================================================
+# NOTE: Letzshop export schemas have been moved to app.modules.marketplace.schemas.letzshop
+# See LetzshopExportRequest, LetzshopExportFileInfo, LetzshopExportResponse
 
 
-class LetzshopExportRequest(BaseModel):
-    """Request body for Letzshop export to pickup folder."""
+# Re-export VendorStatsResponse from core for convenience
+# This allows tenancy routes to use this schema without importing from core directly
+from app.modules.core.schemas.dashboard import VendorStatsResponse
 
-    include_inactive: bool = Field(
-        default=False,
-        description="Include inactive products in export"
-    )
-
-
-class LetzshopExportFileInfo(BaseModel):
-    """Info about an exported file."""
-
-    language: str
-    filename: str | None = None
-    path: str | None = None
-    size_bytes: int | None = None
-    error: str | None = None
-
-
-class LetzshopExportResponse(BaseModel):
-    """Response from Letzshop export to folder."""
-
-    success: bool
-    message: str
-    vendor_code: str
-    export_directory: str
-    files: list[LetzshopExportFileInfo]
-    celery_task_id: str | None = None  # Set when using Celery async export
-    is_async: bool = Field(default=False, serialization_alias="async")  # True when queued via Celery
-
-    model_config = {"populate_by_name": True}
+__all__ = [
+    "VendorCreate",
+    "VendorUpdate",
+    "VendorResponse",
+    "VendorDetailResponse",
+    "VendorCreateResponse",
+    "VendorListResponse",
+    "VendorSummary",
+    "VendorStatsResponse",
+]