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.

requirements.txt

@@ -18,3 +18,6 @@ pycocotools
 
 # sam3/model_builder.py still imports pkg_resources, which setuptools 81+ dropped
 setuptools<81
+psutil
+shapely
+lap