feat: add counting bench, triage, and dataset modules

This commit includes major additions and updates to the frontend and backend architectures, introducing new dataset management, live counting features, batch processing, and triage logic. Includes new UI pages, components, and API routes.

backend/jobs.py

@@ -27,11 +27,11 @@ from backend import db
 MAX_LOG_LINES = 500
 PROGRESS_FLUSH_SECONDS = 0.5
 
-JOB_TYPES = ("extract", "autolabel", "merge", "train")
-GPU_JOB_TYPES = ("autolabel", "train")
+JOB_TYPES = ("extract", "autolabel", "merge", "train", "count", "clock-scan",
+             "truck-scan")
+GPU_JOB_TYPES = ("autolabel", "train", "count", "truck-scan")
 """`extract` is ffmpeg and `merge` is file copying — neither touches the card,
 so neither should be able to block an interactive assist."""
-
 gpu_lock = threading.Lock()
 """Held for the duration of any GPU work. The job worker takes it around a
 handler; the interactive assist route takes it around one SAM3 call. One card,