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/api/v1/shop/products.py

@@ -11,7 +11,7 @@ Vendor Context: require_vendor_context() - detects vendor from URL/subdomain/dom
 
 import logging
 
-from fastapi import APIRouter, Depends, Path, Query
+from fastapi import APIRouter, Depends, Path, Query, Request
 from sqlalchemy.orm import Session
 
 from app.core.database import get_db
@@ -119,6 +119,7 @@ def get_product_details(
 
 @router.get("/products/search", response_model=ProductListResponse)  # public
 def search_products(
+    request: Request,
     q: str = Query(..., min_length=1, description="Search query"),
     skip: int = Query(0, ge=0),
     limit: int = Query(50, ge=1, le=100),
@@ -128,7 +129,7 @@ def search_products(
     """
     Search products in current vendor's catalog.
 
-    Searches in product names, descriptions, and SKUs.
+    Searches in product names, descriptions, SKUs, brands, and GTINs.
     Vendor is automatically determined from request context (URL/subdomain/domain).
     No authentication required.
 
@@ -137,6 +138,9 @@ def search_products(
     - skip: Number of results to skip (pagination)
     - limit: Maximum number of results to return
     """
+    # Get preferred language from request (via middleware or default)
+    language = getattr(request.state, "language", "en")
+
     logger.debug(
         f"[SHOP_API] search_products: '{q}'",
         extra={
@@ -145,13 +149,18 @@ def search_products(
             "query": q,
             "skip": skip,
             "limit": limit,
+            "language": language,
         },
     )
 
-    # TODO: Implement full-text search functionality
-    # For now, return filtered products
-    products, total = product_service.get_vendor_products(
-        db=db, vendor_id=vendor.id, skip=skip, limit=limit, is_active=True
+    # Search products using the service
+    products, total = product_service.search_products(
+        db=db,
+        vendor_id=vendor.id,
+        query=q,
+        skip=skip,
+        limit=limit,
+        language=language,
     )
 
     return ProductListResponse(