feat(server): 报销单输出工号/邮箱并扩展申请人邮箱前缀匹配

- ExpenseClaimRead 新增 employee_no/employee_email 字段，ExpenseClaim 模型补对应只读属性
- expense_claim_access_policy 在姓名匹配未果时，按 candidate@% 邮箱前缀匹配 Employee.email，命中唯一记录即返回
- test_backend_pagination/test_expense_claim_service 补充工号/邮箱字段断言与邮箱前缀匹配用例
- 更新公司通信费报销规则表

server/src/app/schemas/reimbursement.py

@@ -144,6 +144,8 @@ class ExpenseClaimRead(BaseModel):
     claim_no: str
     employee_id: str | None
     employee_name: str
+    employee_no: str | None = None
+    employee_email: str | None = None
     department_id: str | None
     department_name: str
     employee_position: str | None = None