fix: Letzshop page improvements - products, jobs, and tabs

1. Products tab now shows Letzshop marketplace products instead of vendor products
   - Uses /admin/products endpoint with marketplace=Letzshop filter
   - Fixed field names (image_link, price_numeric, sku vs vendor_sku)
   - Search now works with title, GTIN, SKU, brand

2. Jobs section moved to a separate tab
   - New "Jobs" tab between Exceptions and Settings
   - Tab watcher reloads data when switching tabs
   - Updated filter dropdown (removed export, added historical_import)

3. Product stats endpoint now accepts marketplace and vendor_name filters

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

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

app/api/v1/admin/products.py

@@ -190,11 +190,15 @@ def get_products(
 
 @router.get("/stats", response_model=AdminProductStats)
 def get_product_stats(
+    marketplace: str | None = Query(None, description="Filter by marketplace"),
+    vendor_name: str | None = Query(None, description="Filter by vendor name"),
     db: Session = Depends(get_db),
     current_admin: User = Depends(get_current_admin_api),
 ):
     """Get product statistics for admin dashboard."""
-    stats = marketplace_product_service.get_admin_product_stats(db)
+    stats = marketplace_product_service.get_admin_product_stats(
+        db, marketplace=marketplace, vendor_name=vendor_name
+    )
     return AdminProductStats(**stats)