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/pyproject.toml

@@ -19,6 +19,7 @@ dependencies = [
   "python-dotenv>=1.0.1,<2.0.0",
   "email-validator>=2.2.0,<3.0.0",
   "python-multipart>=0.0.20,<1.0.0",
+  "jieba>=0.42.1,<0.43.0",
   "openpyxl>=3.1.5,<4.0.0",
   "lightrag-hku>=1.4.16,<1.5.0",
   "qdrant-client>=1.18.0,<2.0.0",