refactor(server): user_agent/steward/ocr 等服务重构并适配关联任务

- user_agent 拆分 application/locations/knowledge/response/review 四个子模块，接入申请位置语义与关联草稿分支
- steward planner/runtime/slot/plan_builder 决策链路重构，travel_reimbursement_calculator/orchestrator_expense_query 适配
- ocr/document_preview/document_intelligence/receipt_folder 复用预览与资产缓存，expense_claim_draft_flow/application_handoff 适配
- pyproject.toml 新增依赖，paddleocr bootstrap 脚本与 server_start.sh 调整
- 更新差旅/交通/通信等财务规则表，同步 document_intelligence/ocr/receipt_folder/user_agent 等测试

server/src/app/services/notification_states.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from datetime import UTC, datetime
+from threading import Lock
 
 from sqlalchemy import select
 from sqlalchemy.orm import Session
@@ -16,11 +17,23 @@ from app.schemas.notification_state import (
 
 
 class NotificationStateService:
+    _storage_ready_bind_ids: set[int] = set()
+    _storage_ready_lock = Lock()
+
     def __init__(self, db: Session) -> None:
         self.db = db
 
     def ensure_storage_ready(self) -> None:
-        Base.metadata.create_all(bind=self.db.get_bind(), tables=[NotificationState.__table__])
+        bind = self.db.get_bind()
+        bind_id = id(bind)
+        if bind_id in self._storage_ready_bind_ids:
+            return
+
+        with self._storage_ready_lock:
+            if bind_id in self._storage_ready_bind_ids:
+                return
+            Base.metadata.create_all(bind=bind, tables=[NotificationState.__table__])
+            self._storage_ready_bind_ids.add(bind_id)
 
     def list_states(self, current_user: CurrentUserContext) -> NotificationStateListRead:
         self.ensure_storage_ready()