Fix /timelapse endpoint with correct Gradio API params

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.py

@@ -30,11 +30,11 @@ async def generate_timelapse(
 
         client = Client("multimodalart/wan-2-2-first-last-frame")
         result = client.predict(
-            image=handle_file(start_path),
-            last_image=handle_file(end_path),
+            start_image_pil=handle_file(start_path),
+            end_image_pil=handle_file(end_path),
             prompt=prompt,
-            api_name="/generate",
+            api_name="/generate_video",
         )
 
-        output_path = result if isinstance(result, str) else result[0]
+        output_path = result[0] if isinstance(result, (list, tuple)) else result
         return FileResponse(output_path, media_type="video/mp4", filename="timelapse.mp4")