fixed: robust initial caching

https://github.com/comfyanonymous/ComfyUI/issues/7003#issuecomment-2690687621

modified: store `db_mode` setting to `config.ini`
https://github.com/ltdrdata/ComfyUI-Manager/issues/1582#issuecomment-2687332355

remove: fetch updates / skip updates
- 'updates' filter will trigger fetching
https://github.com/ltdrdata/ComfyUI-Manager/issues/1584

added: support for `disable_front` or `DISABLE_COMFYUI_MANAGER_FRONT`

glob/cm_global.py

@@ -112,4 +112,6 @@ def add_on_revision_detected(k, f):
         variables['cm.on_revision_detected_handler'].append((k, f))
 
 
-error_dict = {}
+error_dict = {}
+
+disable_front = False