fix: drop dead code phase2 unused class (#22042)

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

api/services/entities/knowledge_entities/knowledge_entities.py

@@ -4,13 +4,6 @@ from typing import Literal, Optional
 from pydantic import BaseModel
 
 
-class SegmentUpdateEntity(BaseModel):
-    content: str
-    answer: Optional[str] = None
-    keywords: Optional[list[str]] = None
-    enabled: Optional[bool] = None
-
-
 class ParentMode(StrEnum):
     FULL_DOC = "full-doc"
     PARAGRAPH = "paragraph"
@@ -153,10 +146,6 @@ class MetadataUpdateArgs(BaseModel):
     value: Optional[str | int | float] = None
 
 
-class MetadataValueUpdateArgs(BaseModel):
-    fields: list[MetadataUpdateArgs]
-
-
 class MetadataDetail(BaseModel):
     id: str
     name: str