feat: implement product search, media library, and vendor customers

- Add full-text product search in ProductService.search_products()
  searching titles, descriptions, SKUs, brands, and GTINs
- Implement complete vendor media library with file uploads,
  thumbnails, folders, and product associations
- Implement vendor customers API with listing, details, orders,
  statistics, and status management
- Add shop search results UI with pagination and add-to-cart
- Add vendor media library UI with drag-drop upload and grid view
- Add database migration for media_files and product_media tables
- Update TODO file with current launch status (~95% complete)

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

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

app/routes/vendor_pages.py

@@ -358,6 +358,30 @@ async def vendor_customers_page(
     )
 
 
+# ============================================================================
+# MEDIA LIBRARY
+# ============================================================================
+
+
+@router.get(
+    "/{vendor_code}/media", response_class=HTMLResponse, include_in_schema=False
+)
+async def vendor_media_page(
+    request: Request,
+    vendor_code: str = Path(..., description="Vendor code"),
+    current_user: User = Depends(get_current_vendor_from_cookie_or_header),
+    db: Session = Depends(get_db),
+):
+    """
+    Render media library page.
+    JavaScript loads media files via API.
+    """
+    return templates.TemplateResponse(
+        "vendor/media.html",
+        get_vendor_context(request, db, current_user, vendor_code),
+    )
+
+
 # ============================================================================
 # MESSAGING
 # ============================================================================