feat: 新增员工行为画像算法与费用风险标签体系

后端新增员工行为画像算法模块，支持标签规则引擎和评分计算，
完善员工模型、银行信息、序列化和导入逻辑，优化报销审批流
和工作流常量，增强 Hermes 同步和知识同步能力，前端新增费
用画像详情弹窗、雷达图和风险卡片组件，完善登录页和工作台
样式，优化文档中心和归档中心交互，补充单元测试。

server/src/app/api/v1/endpoints/reimbursements.py

@@ -601,6 +601,38 @@ def approve_expense_claim(
     return claim
 
 
+@router.post(
+    "/claims/{claim_id}/pay",
+    response_model=ExpenseClaimRead,
+    summary="确认报销单已付款",
+    description="财务人员或高级财务人员确认待付款报销单已完成付款。",
+    responses={
+        status.HTTP_404_NOT_FOUND: {
+            "model": ErrorResponse,
+            "description": "单据不存在。",
+        },
+        status.HTTP_400_BAD_REQUEST: {
+            "model": ErrorResponse,
+            "description": "当前用户或单据状态不允许确认付款。",
+        },
+    },
+)
+def pay_expense_claim(
+    claim_id: str,
+    db: DbSession,
+    current_user: CurrentUser,
+) -> ExpenseClaimRead:
+    service = ExpenseClaimService(db)
+    try:
+        claim = service.mark_claim_paid(claim_id, current_user)
+    except ValueError as error:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(error)) from error
+
+    if claim is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Claim not found")
+    return claim
+
+
 @router.delete(
     "/claims/{claim_id}",
     response_model=ExpenseClaimActionResponse,