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/ontology_validation.py

@@ -214,7 +214,7 @@ class OntologyValidationMixin:
         labels = [self._display_slot_label(item) for item in missing_slots[:4]]
         if not labels:
             return "请补充更多上下文后再继续。"
-        return f"请补充{'、'.join(labels)}，我再继续帮你解析和处理。"
+        return f"请补充{'、'.join(labels)}，我会继续帮您解析和处理。"
 
     @staticmethod
     def _compute_confidence(