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/services/marketplace_product_service.py

@@ -681,36 +681,59 @@ class MarketplaceProductService:
 
         return result, total
 
-    def get_admin_product_stats(self, db: Session) -> dict:
-        """Get product statistics for admin dashboard."""
+    def get_admin_product_stats(
+        self,
+        db: Session,
+        marketplace: str | None = None,
+        vendor_name: str | None = None,
+    ) -> dict:
+        """Get product statistics for admin dashboard.
+
+        Args:
+            db: Database session
+            marketplace: Optional filter by marketplace (e.g., 'Letzshop')
+            vendor_name: Optional filter by vendor name
+        """
         from sqlalchemy import func
 
-        total = db.query(func.count(MarketplaceProduct.id)).scalar() or 0
+        # Build base filter
+        base_filters = []
+        if marketplace:
+            base_filters.append(MarketplaceProduct.marketplace == marketplace)
+        if vendor_name:
+            base_filters.append(MarketplaceProduct.vendor_name == vendor_name)
 
-        active = (
-            db.query(func.count(MarketplaceProduct.id))
-            .filter(MarketplaceProduct.is_active == True)  # noqa: E712
-            .scalar()
-            or 0
+        base_query = db.query(func.count(MarketplaceProduct.id))
+        if base_filters:
+            base_query = base_query.filter(*base_filters)
+
+        total = base_query.scalar() or 0
+
+        active_query = db.query(func.count(MarketplaceProduct.id)).filter(
+            MarketplaceProduct.is_active == True  # noqa: E712
         )
+        if base_filters:
+            active_query = active_query.filter(*base_filters)
+        active = active_query.scalar() or 0
         inactive = total - active
 
-        digital = (
-            db.query(func.count(MarketplaceProduct.id))
-            .filter(MarketplaceProduct.is_digital == True)  # noqa: E712
-            .scalar()
-            or 0
+        digital_query = db.query(func.count(MarketplaceProduct.id)).filter(
+            MarketplaceProduct.is_digital == True  # noqa: E712
         )
+        if base_filters:
+            digital_query = digital_query.filter(*base_filters)
+        digital = digital_query.scalar() or 0
         physical = total - digital
 
-        marketplace_counts = (
-            db.query(
-                MarketplaceProduct.marketplace,
-                func.count(MarketplaceProduct.id),
-            )
-            .group_by(MarketplaceProduct.marketplace)
-            .all()
+        marketplace_query = db.query(
+            MarketplaceProduct.marketplace,
+            func.count(MarketplaceProduct.id),
         )
+        if base_filters:
+            marketplace_query = marketplace_query.filter(*base_filters)
+        marketplace_counts = marketplace_query.group_by(
+            MarketplaceProduct.marketplace
+        ).all()
         by_marketplace = {mp or "unknown": count for mp, count in marketplace_counts}
 
         return {