feat: add proper Pydantic response_model to all stats endpoints

- Create comprehensive stats schemas in models/schema/stats.py:
  - ImportStatsResponse, UserStatsResponse, ProductStatsResponse
  - PlatformStatsResponse, AdminDashboardResponse
  - VendorDashboardStatsResponse with nested models
  - VendorAnalyticsResponse, CodeQualityDashboardStatsResponse
- Move DashboardStatsResponse from code_quality.py to schema file
- Fix get_vendor_statistics() to return pending_vendors field
- Fix get_vendor_stats() to return flat structure matching schema
- Add response_model to all stats endpoints:
  - GET /admin/dashboard -> AdminDashboardResponse
  - GET /admin/dashboard/stats/platform -> PlatformStatsResponse
  - GET /admin/marketplace-import-jobs/stats -> ImportStatsResponse
  - GET /vendor/dashboard/stats -> VendorDashboardStatsResponse
  - GET /vendor/analytics -> VendorAnalyticsResponse
- Enhance API-001 architecture rule with detailed guidance
- Add SVC-007 rule for service/schema compatibility

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/api/v1/vendor/dashboard.py

@@ -17,12 +17,20 @@ from app.exceptions import VendorNotActiveException
 from app.services.stats_service import stats_service
 from app.services.vendor_service import vendor_service
 from models.database.user import User
+from models.schema.stats import (
+    VendorCustomerStats,
+    VendorDashboardStatsResponse,
+    VendorInfo,
+    VendorOrderStats,
+    VendorProductStats,
+    VendorRevenueStats,
+)
 
 router = APIRouter(prefix="/dashboard")
 logger = logging.getLogger(__name__)
 
 
-@router.get("/stats")
+@router.get("/stats", response_model=VendorDashboardStatsResponse)
 def get_vendor_dashboard_stats(
     request: Request,
     current_user: User = Depends(get_current_vendor_api),
@@ -51,27 +59,27 @@ def get_vendor_dashboard_stats(
     # Get vendor-scoped statistics
     stats_data = stats_service.get_vendor_stats(db=db, vendor_id=vendor_id)
 
-    return {
-        "vendor": {
-            "id": vendor.id,
-            "name": vendor.name,
-            "vendor_code": vendor.vendor_code,
-        },
-        "products": {
-            "total": stats_data.get("total_products", 0),
-            "active": stats_data.get("active_products", 0),
-        },
-        "orders": {
-            "total": stats_data.get("total_orders", 0),
-            "pending": stats_data.get("pending_orders", 0),
-            "completed": stats_data.get("completed_orders", 0),
-        },
-        "customers": {
-            "total": stats_data.get("total_customers", 0),
-            "active": stats_data.get("active_customers", 0),
-        },
-        "revenue": {
-            "total": stats_data.get("total_revenue", 0),
-            "this_month": stats_data.get("revenue_this_month", 0),
-        },
-    }
+    return VendorDashboardStatsResponse(
+        vendor=VendorInfo(
+            id=vendor.id,
+            name=vendor.name,
+            vendor_code=vendor.vendor_code,
+        ),
+        products=VendorProductStats(
+            total=stats_data.get("total_products", 0),
+            active=stats_data.get("active_products", 0),
+        ),
+        orders=VendorOrderStats(
+            total=stats_data.get("total_orders", 0),
+            pending=stats_data.get("pending_orders", 0),
+            completed=stats_data.get("completed_orders", 0),
+        ),
+        customers=VendorCustomerStats(
+            total=stats_data.get("total_customers", 0),
+            active=stats_data.get("active_customers", 0),
+        ),
+        revenue=VendorRevenueStats(
+            total=stats_data.get("total_revenue", 0),
+            this_month=stats_data.get("revenue_this_month", 0),
+        ),
+    )