feat(auto-organize): improve exclusion handling and progress reporting

- Add auto_organize_exclusions to settings handler proxy keys
- Refactor model file service to handle exclusions relative to model roots
- Improve auto-organize progress reporting for empty operations
- Fix exclusion pattern matching to consider relative paths within model roots
- Ensure proper validation when no model roots are configured
- Add comprehensive cleanup reporting for empty auto-organize operations

py/routes/handlers/misc_handlers.py

@@ -202,6 +202,7 @@ class SettingsHandler:
         "model_card_footer_action",
         "model_name_display",
         "update_flag_strategy",
+        "auto_organize_exclusions",
     )
 
     _PROXY_KEYS = {"proxy_enabled", "proxy_host", "proxy_port", "proxy_username", "proxy_password", "proxy_type"}