fix: 修复员工服务、报销单审批及前端交互细节

- 修复员工创建时组织架构关联与邮箱校验逻辑
- 修复报销单API端点参数及预审流程调用
- 优化审批中心、差旅详情等前端页面交互
- 更新侧边栏导航与请求视图模型
- 补充员工服务与报销单相关测试用例

server/src/app/services/expense_claims.py

@@ -867,13 +867,13 @@ class ExpenseClaimService:
             "source": "manual_return",
             "severity": "medium",
             "label": "人工退回",
-            "message": return_reason or f"{operator} 已退回该报销单，请申请人补充后重新提交。",
+            "message": return_reason or f"{operator} 已退回该报销单，请申请人调整后重新提交。",
             "operator": operator,
             "created_at": datetime.now(UTC).isoformat(),
         }
 
         claim.status = "returned"
-        claim.approval_stage = "待补充"
+        claim.approval_stage = "待提交"
         claim.risk_flags_json = [*list(claim.risk_flags_json or []), return_flag]
 
         self.db.commit()
@@ -2634,8 +2634,8 @@ class ExpenseClaimService:
 
     def _ensure_draft_claim(self, claim: ExpenseClaim) -> None:
         normalized_status = str(claim.status or "").strip().lower()
-        if normalized_status not in {"draft", "supplement"}:
-            raise ValueError("只有草稿或待补充状态的报销单才允许执行该操作。")
+        if normalized_status not in {"draft", "supplement", "returned"}:
+            raise ValueError("只有草稿、待补充或退回待提交状态的报销单才允许执行该操作。")
 
     def _run_ai_submission_review(self, claim: ExpenseClaim) -> dict[str, Any]:
         base_flags = list(claim.risk_flags_json or [])