Multitenant implementation with custom Domain, theme per vendor

app/api/v1/admin/pages.py

@@ -16,6 +16,7 @@ Routes:
 - GET /vendors/create → Create vendor form (auth required)
 - GET /vendors/{vendor_code} → Vendor details (auth required)
 - GET /vendors/{vendor_code}/edit → Edit vendor form (auth required)
+- GET /vendors/{vendor_code}/domains → Vendor domains management (auth required)
 - GET /users         → User management page (auth required)
 - GET /imports       → Import history page (auth required)
 - GET /settings      → Settings page (auth required)
@@ -166,6 +167,55 @@ async def admin_vendor_edit_page(
     )
 
 
+# ============================================================================
+# VENDOR DOMAINS ROUTES
+# ============================================================================
+
+@router.get("/vendors/{vendor_code}/domains", response_class=HTMLResponse, include_in_schema=False)
+async def admin_vendor_domains_page(
+        request: Request,
+        vendor_code: str = Path(..., description="Vendor code"),
+        current_user: User = Depends(get_current_admin_user),
+        db: Session = Depends(get_db)
+):
+    """
+    Render vendor domains management page.
+    Shows custom domains, verification status, and DNS configuration.
+    """
+    return templates.TemplateResponse(
+        "admin/vendor-domains.html",
+        {
+            "request": request,
+            "user": current_user,
+            "vendor_code": vendor_code,
+        }
+    )
+
+
+# ============================================================================
+# VENDOR THEMES ROUTES
+# ============================================================================
+
+@router.get("/vendors/{vendor_code}/theme", response_class=HTMLResponse, include_in_schema=False)
+async def admin_vendor_theme_page(
+        request: Request,
+        vendor_code: str = Path(..., description="Vendor code"),
+        current_user: User = Depends(get_current_admin_user),
+        db: Session = Depends(get_db)
+):
+    """
+    Render vendor theme customization page.
+    """
+    return templates.TemplateResponse(
+        "admin/vendor-theme.html",
+        {
+            "request": request,
+            "user": current_user,
+            "vendor_code": vendor_code,
+        }
+    )
+
+
 # ============================================================================
 # USER MANAGEMENT ROUTES
 # ============================================================================
@@ -257,6 +307,7 @@ async def admin_components_page(
         }
     )
 
+
 @router.get("/icons", response_class=HTMLResponse, include_in_schema=False)
 async def admin_icons_page(
     request: Request,
@@ -275,6 +326,7 @@ async def admin_icons_page(
         }
     )
 
+
 @router.get("/testing", response_class=HTMLResponse, include_in_schema=False)
 async def admin_testing_hub(
         request: Request,