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

lsfx-mock-server/services/token_service.py

@@ -0,0 +1,49 @@
+from models.request import GetTokenRequest
+from utils.response_builder import ResponseBuilder
+from config.settings import settings
+from typing import Dict
+
+
+class TokenService:
+    """Token管理服务"""
+
+    def __init__(self):
+        self.project_counter = settings.INITIAL_PROJECT_ID
+        self.tokens = {}  # projectId -> token_data
+
+    def create_token(self, request: GetTokenRequest) -> Dict:
+        """创建Token
+
+        Args:
+            request: 获取Token请求
+
+        Returns:
+            Token响应字典
+        """
+        # 生成唯一项目ID
+        self.project_counter += 1
+        project_id = self.project_counter
+
+        # 构建响应
+        response = ResponseBuilder.build_success_response(
+            "token",
+            project_id=project_id,
+            project_no=request.projectNo,
+            entity_name=request.entityName
+        )
+
+        # 存储token信息
+        self.tokens[project_id] = response.get("data")
+
+        return response
+
+    def get_project(self, project_id: int) -> Dict:
+        """获取项目信息
+
+        Args:
+            project_id: 项目ID
+
+        Returns:
+            项目信息字典
+        """
+        return self.tokens.get(project_id)