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/models/financial_record.py

@@ -58,6 +58,14 @@ class ExpenseClaim(Base):
     def employee_position(self) -> str | None:
         return str(self.employee.position).strip() if self.employee is not None and self.employee.position else None
 
+    @property
+    def employee_no(self) -> str | None:
+        return str(self.employee.employee_no).strip() if self.employee is not None and self.employee.employee_no else None
+
+    @property
+    def employee_email(self) -> str | None:
+        return str(self.employee.email).strip() if self.employee is not None and self.employee.email else None
+
     @property
     def employee_grade(self) -> str | None:
         return str(self.employee.grade).strip() if self.employee is not None and self.employee.grade else None