fix: add missing /detect/verdicts endpoint and clean up imports

The frontend was calling GET /detect/verdicts/{job_id} but no route
existed — verdicts were computed but never reached the UI. Also
consolidates inline storage imports to top-level and removes stale
design-note comments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app.py

@@ -53,6 +53,9 @@ from jobs.storage import (
     get_job_directory,
     get_job_storage,
     get_output_video_path,
+    get_track_data,
+    get_track_summary,
+    get_verdicts,
 )
 from models.segmenters.model_loader import get_segmenter_detector
 from pydantic import BaseModel
@@ -506,8 +509,6 @@ async def detect_status(job_id: str):
 @app.get("/detect/tracks/{job_id}/summary")
 async def get_track_summary_endpoint(job_id: str):
     """Return per-frame detection counts for timeline heatmap."""
-    from jobs.storage import get_track_summary, get_job_storage
-    import cv2
 
     job = get_job_storage().get(job_id)
     if not job:
@@ -549,17 +550,19 @@ async def get_frame_tracks(job_id: str, frame_idx: int):
     # Let's use a global cache in memory for active jobs?
     # See inference.py: 'all_detections_map' is local to that function.
     
-    # BETTER APPROACH for this demo:
-    # Use a simple shared dictionary in jobs/storage.py or app.py used by inference.
-    # We will pass a callback or shared dict to run_inference.
-    
-    # For now, let's just return 404 if not implemented, but I need to implement it.
-    # I'll add a cache in app.py for active job tracks?
-    from jobs.storage import get_track_data
     data = get_track_data(job_id, frame_idx)
     return data or []
 
 
+@app.get("/detect/verdicts/{job_id}")
+async def get_verdicts_endpoint(job_id: str):
+    """Return all assessment verdicts for a job, keyed by track_id."""
+    job = get_job_storage().get(job_id)
+    if not job:
+        raise HTTPException(status_code=404, detail="Job not found or expired.")
+    return get_verdicts(job_id)
+
+
 @app.delete("/detect/job/{job_id}")
 async def cancel_job(job_id: str):
     """Cancel a running job."""