feat(security): dedicated install flags decouple git_url/pip from security_level

Add two boolean config.ini [default] flags — allow_git_url_install and
allow_pip_install (both default false) — that fully REPLACE the
security_level term on the legacy install surfaces:

- POST /v2/customnode/install/git_url (S-A) and
  POST /v2/customnode/install/pip (S-B) are now gated solely by their
  dedicated flag AND the retained network-position invariant
  (loopback listener OR network_mode=personal_cloud). security_level
  no longer affects these two surfaces in either direction.
- The batch unknown-URL branch (S-C) routes through the same predicate;
  the unknown-pip branch stays unconditionally blocked; the general
  middle+ batch entry gate is unchanged.
- New pure predicate is_dedicated_install_allowed() in
  common/manager_security.py (config-import-free; callers pass values
  from their own reader). Both config readers (glob + legacy) register
  the keys in read/write/fallback paths.
- Denial logs and frontend copy name the responsible flag instead of
  the misleading security_level guidance. Public listeners remain
  denied regardless of the flags (no exposure widening).
- README security policy updated: config keys documented, git-url/pip
  removed from the security_level risky table, and a dedicated-flags
  subsection (REPLACE semantics, network rule, batch behavior,
  restart-only activation, weak/normal- opt-in migration note).
- Migration: existing weak/normal- users must opt in via the new flags
  (CHANGELOG note; deliberate no auto-seed).

Includes the unit/config/guard test suites (88 tests): predicate truth
table, dual-reader config contract (missing/malformed keys read false,
round-trip, cache staleness), security_level-matrix freeze guards, and
suite-order-independent test stubs.

comfyui_manager/glob/constants.py

@@ -5,6 +5,8 @@ SECURITY_MESSAGE_HIGH_P = "ERROR: To use this action, '--listen' must be set to
 SECURITY_MESSAGE_NORMAL_MINUS = "ERROR: To use this feature, you must either set '--listen' to a local IP and set the security level to 'normal-' or lower, or set the security level to 'middle' or 'weak'. Please contact the administrator.\nReference: https://github.com/ltdrdata/ComfyUI-Manager#security-policy"
 SECURITY_MESSAGE_GENERAL = "ERROR: This installation is not allowed in this security_level. Please contact the administrator.\nReference: https://github.com/ltdrdata/ComfyUI-Manager#security-policy"
 SECURITY_MESSAGE_NORMAL_MINUS_MODEL = "ERROR: Downloading models that are not in '.safetensors' format is only allowed for models registered in the 'default' channel at this security level. If you want to download this model, set the security level to 'normal-' or lower."
+SECURITY_MESSAGE_FLAG_GIT_URL = "ERROR: This action requires 'allow_git_url_install = true' in config.ini ([default] section). This setting is independent of security_level. Please contact the administrator.\nReference: https://github.com/Comfy-Org/ComfyUI-Manager#security-policy"
+SECURITY_MESSAGE_FLAG_PIP = "ERROR: This action requires 'allow_pip_install = true' in config.ini ([default] section). This setting is independent of security_level. Please contact the administrator.\nReference: https://github.com/Comfy-Org/ComfyUI-Manager#security-policy"
 
 
 def is_loopback(address):

comfyui_manager/glob/manager_core.py

@@ -1706,6 +1706,8 @@ def write_config():
         'network_mode': get_config()['network_mode'],
         'db_mode': get_config()['db_mode'],
         'verbose': get_config()['verbose'],
+        'allow_git_url_install': get_config()['allow_git_url_install'],
+        'allow_pip_install': get_config()['allow_pip_install'],
     }
 
     # Sanitize all string values to prevent CRLF injection attacks
@@ -1755,6 +1757,8 @@ def read_config():
                     'security_level': default_conf.get('security_level', SecurityLevel.NORMAL.value).lower(),
                     'db_mode': default_conf.get('db_mode', DBMode.CACHE.value).lower(),
                     'verbose': get_bool('verbose', False),
+                    'allow_git_url_install': get_bool('allow_git_url_install', False),
+                    'allow_pip_install': get_bool('allow_pip_install', False),
                }
 
     except Exception:
@@ -1783,6 +1787,8 @@ def read_config():
             'security_level': SecurityLevel.NORMAL.value,
             'db_mode': DBMode.CACHE.value,
             'verbose': False,
+            'allow_git_url_install': False,
+            'allow_pip_install': False,
         }