feat: 添加获取当前用户积分余额的接口

test_target_score.http

@@ -0,0 +1,32 @@
+### 获取目标点数接口测试
+
+# 测试获取目标点数
+GET http://localhost:8080/api/link/target-score?codeNo=YOUR_CODE_NO_HERE
+Accept: application/json
+
+### 
+
+# 示例：使用实际的codeNo测试
+# GET http://localhost:8080/api/link/target-score?codeNo=ABC123DEF456
+# Accept: application/json
+
+###
+
+# 响应格式示例：
+# 成功时：
+# {
+#   "success": true,
+#   "completedPoints": 13750,
+#   "machineId": "device123",
+#   "codeNo": "ABC123DEF456",
+#   "errorMessage": null
+# }
+# 
+# 失败时：
+# {
+#   "success": false,
+#   "completedPoints": null,
+#   "machineId": "device123",
+#   "codeNo": "ABC123DEF456", 
+#   "errorMessage": "网络繁忙，稍后再试"
+# }