refactor(backend): update services and register OCR router

- router.py: register ocr_router with OCR tag
- ontology.py: update ontology service logic
- orchestrator.py: update orchestrator service logic
- user_agent.py: update user agent schema and service
- schemas/user_agent.py: update user agent data schemas

server/src/app/schemas/user_agent.py

@@ -29,6 +29,9 @@ class UserAgentDraftPayload(BaseModel):
     title: str = Field(description="草稿标题。")
     body: str = Field(description="草稿正文。")
     confirmation_required: bool = Field(default=True, description="是否需要人工确认。")
+    claim_id: str | None = Field(default=None, description="关联的报销草稿 ID。")
+    claim_no: str | None = Field(default=None, description="关联的报销草稿单号。")
+    status: str | None = Field(default=None, description="当前报销草稿状态。")
 
 
 class UserAgentRequest(BaseModel):