feat: reveal all hidden shapes with Shift+H, release SAM3 VRAM on idle and on demand (REQ-191, REQ-192)

backend/main.py

@@ -17,7 +17,8 @@ from fastapi.middleware.cors import CORSMiddleware
 from backend import archive_index, config, db, jobs
 from backend.api import (batches, counting_bench as counting_bench_routes,
                          datasets as dataset_routes, jobs as job_routes,
-                         live_count as live_count_routes, models, projects, review, triage)
+                         live_count as live_count_routes, models, projects, review,
+                         sam3, triage)
 
 
 @asynccontextmanager
@@ -47,6 +48,7 @@ app.add_middleware(
 app.include_router(projects.router)
 app.include_router(batches.router)
 app.include_router(review.router)
+app.include_router(sam3.router)
 app.include_router(models.router)
 app.include_router(job_routes.router)
 app.include_router(triage.router)