Change to 5-second segments and lower score threshold for testing

- Reduce segment interval from 20s to 5s for faster testing
- Lower min_score from 6.5 to 3.0 to increase segment qualification
- Isolate visual analysis timeout issues with shorter segments
- Enable more granular debugging of processing pipeline

highlights_api.py

@@ -111,8 +111,8 @@ async def root():
 async def upload_video(
     background_tasks: BackgroundTasks,
     video: UploadFile = File(...),
-    interval: float = 20.0,
-    min_score: float = 6.5,
+    interval: float = 5.0,
+    min_score: float = 3.0,
     max_highlights: int = 3,
     whisper_model: str = "base",
     timeout: int = 120