fix: TENCENT_VECTOR_DB_REPLICAS can be set to 0 (#5968)

Co-authored-by: jianglin <jianglin@wangxiaobao.com>

api/configs/middleware/vdb/tencent_vector_config.py

@@ -1,6 +1,6 @@
 from typing import Optional
 
-from pydantic import BaseModel, Field, PositiveInt
+from pydantic import BaseModel, Field, NonNegativeInt, PositiveInt
 
 
 class TencentVectorDBConfig(BaseModel):
@@ -24,7 +24,7 @@ class TencentVectorDBConfig(BaseModel):
     )
 
     TENCENT_VECTOR_DB_USERNAME: Optional[str] = Field(
-        description='Tencent Vector password',
+        description='Tencent Vector username',
         default=None,
     )
 
@@ -38,7 +38,7 @@ class TencentVectorDBConfig(BaseModel):
         default=1,
     )
 
-    TENCENT_VECTOR_DB_REPLICAS: PositiveInt = Field(
+    TENCENT_VECTOR_DB_REPLICAS: NonNegativeInt = Field(
         description='Tencent Vector replicas',
         default=2,
     )