feat(services): implement token, file, and statement services

lsfx-mock-server/services/statement_service.py

@@ -0,0 +1,33 @@
+from models.request import GetBankStatementRequest
+from utils.response_builder import ResponseBuilder
+from typing import Dict
+
+
+class StatementService:
+    """流水数据服务"""
+
+    def get_bank_statement(self, request: GetBankStatementRequest) -> Dict:
+        """获取银行流水列表
+
+        Args:
+            request: 获取银行流水请求
+
+        Returns:
+            银行流水响应字典
+        """
+        # 加载模板
+        template = ResponseBuilder.load_template("bank_statement")
+        statements = template["success_response"]["data"]["bankStatementList"]
+        total_count = len(statements)
+
+        # 模拟分页
+        start = (request.pageNow - 1) * request.pageSize
+        end = start + request.pageSize
+        page_data = statements[start:end]
+
+        return {
+            "code": "200",
+            "data": {"bankStatementList": page_data, "totalCount": total_count},
+            "status": "200",
+            "successResponse": True,
+        }