fix: also limit count in auto-generate endpoint + slice custom items

backend/app/api/listing_free.py

@@ -100,12 +100,13 @@ async def auto_generate(body: dict):
     product_info = body.get("product_info", "").strip()
     wangp_url = body.get("wangp_url", "").strip()
     model_choice = body.get("model_choice", "Wan2GP")
-    resolution = body.get("resolution", "1088x1088")
+    resolution = body.get("resolution", "720x720")
     steps = body.get("steps", 20)
     guidance = body.get("guidance", 4)
     ref_strength = body.get("ref_strength", 75)
     negative_prompt = body.get("negative_prompt", "")
     custom_items = body.get("items")  # optional, use instead of GPT prompts
+    count = min(body.get("count", 9), 9)
 
     if not sid:
         raise HTTPException(400, "Missing session_id")
@@ -123,7 +124,7 @@ async def auto_generate(body: dict):
     s["status"] = "generating"
 
     if custom_items:
-        items = custom_items
+        items = custom_items[:count]
     else:
         if not openai_key:
             s["status"] = "error"
@@ -138,6 +139,8 @@ async def auto_generate(body: dict):
             s["status"] = "error"
             return {"ok": False, "error": f"GPT analysis failed: {str(e)}"}
 
+    items = items[:count]
+
     wangp_cfg = {
         "url": wangp_url,
         "model": model_choice,