fix: address code review feedback

- Fix missing import for compute_filename_for_reference in ingest.py
- Apply code review fixes across routes, queries, scanner, seeder,
  hashing, ingest, path_utils, main, and server
- Update and add tests for sync references and seeder

Amp-Thread-ID: https://ampcode.com/threads/T-019cb61a-ed54-738c-a05f-9b5242e513f3
Co-authored-by: Amp <amp@ampcode.com>

server.py

@@ -34,7 +34,7 @@ from comfyui_version import __version__
 from app.frontend_management import FrontendManager, parse_version
 from comfy_api.internal import _ComfyNodeInternal
 from app.assets.seeder import asset_seeder
-from app.assets.api.routes import register_assets_system
+from app.assets.api.routes import register_assets_routes
 
 from app.user_manager import UserManager
 from app.model_manager import ModelFileManager
@@ -240,7 +240,10 @@ class PromptServer():
         )
         logging.info(f"[Prompt Server] web root: {self.web_root}")
         if args.enable_assets:
-            register_assets_system(self.app, self.user_manager)
+            register_assets_routes(self.app, self.user_manager)
+        else:
+            register_assets_routes(self.app)
+            asset_seeder.disable()
         routes = web.RouteTableDef()
         self.routes = routes
         self.last_node_id = None