Release/e-1.8.1 (#25613)

Co-authored-by: zxhlyh <jasonapring2015@outlook.com>
Co-authored-by: GareArc <chen4851@purdue.edu>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: hjlarry <hjlarry@163.com>

api/services/enterprise/plugin_manager_service.py

@@ -9,9 +9,9 @@ from services.errors.base import BaseServiceError
 logger = logging.getLogger(__name__)
 
 
-class PluginCredentialType(enum.IntEnum):
-    MODEL = enum.auto()
-    TOOL = enum.auto()
+class PluginCredentialType(enum.Enum):
+    MODEL = 0  # must be 0 for API contract compatibility
+    TOOL = 1  # must be 1 for API contract compatibility
 
     def to_number(self):
         return self.value