feat: 添加构建时间信息和相关功能

back-end/spec/openapi.yaml

@@ -57,6 +57,11 @@ components:
         status:
           type: string
           example: success
+        build_time:
+          type: string
+          nullable: true
+          description: 最近一次构建时间；开发模式下若未执行构建则可能为空
+          format: date-time
     WechatProfileRequest:
       type: object
       required: [users_name, users_phone_code, users_picture]
@@ -197,7 +202,7 @@ paths:
     post:
       tags: [系统]
       summary: Test endpoint
-      description: Returns a hello world message
+      description: Returns a hello world message and build time
       responses:
         '200':
           description: Successful response