feat(client): 新增家属端设备查询与端隔离鉴权

- 新增 ClientController，支持已绑定设备的信息、定位、应用与截图查询
- JWT 增加 clientType 标识，实现 admin/client 端鉴权隔离
- client 端支持独立配置令牌有效期，并在刷新时按端解析 TTL
- 截图列表仅返回最近 20 条并规范化访问 URL 前缀

src/main/java/com/youlai/boot/device/model/vo/DeviceBriefVO.java

@@ -0,0 +1,36 @@
+package com.youlai.boot.device.model.vo;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+
+/**
+ * 设备简要信息视图对象（家属端"我的设备"列表使用）
+ *
+ * @author TTSTD
+ * @since 2026/08/17
+ */
+@Schema(description = "设备简要信息")
+@Data
+public class DeviceBriefVO implements Serializable {
+
+    @Schema(description = "设备序列号")
+    private String serialno;
+
+    @Schema(description = "设备名称")
+    private String snName;
+
+    @Schema(description = "设备型号")
+    private String snModel;
+
+    @Schema(description = "绑定手机号")
+    private String snMobile;
+
+    @Schema(description = "状态(0-未激活 1-正常)")
+    private Integer status;
+
+    @Schema(description = "激活时间")
+    private LocalDateTime activateTime;
+}

src/main/java/com/youlai/boot/device/service/impl/ScreenshotServiceImpl.java

@@ -28,16 +28,30 @@ public class ScreenshotServiceImpl extends ServiceImpl<ScreenshotMapper, SnScree
 
     @Override
     public List<ScreenshotVO> listBySn(String sn) {
+        // 按 upload_time 倒序仅取最近 20 张，避免截图量大时返回全量影响性能与首页加载。
         List<SnScreenshot> list = this.list(
                 new LambdaQueryWrapper<SnScreenshot>()
                         .eq(SnScreenshot::getSn, sn)
                         .orderByDesc(SnScreenshot::getUploadTime)
+                        .last("LIMIT 20")
         );
+        // 规范化访问前缀，避免配置值含多余斜杠导致 URL 拼接异常。
+        String prefix = accessUrlPrefix;
+        if (prefix == null || prefix.isEmpty()) {
+            prefix = "/static";
+        }
+        if (!prefix.startsWith("/")) {
+            prefix = "/" + prefix;
+        }
+        while (prefix.endsWith("/")) {
+            prefix = prefix.substring(0, prefix.length() - 1);
+        }
+        final String base = prefix + "/screenshot/";
         return list.stream().map(entity -> {
             ScreenshotVO vo = new ScreenshotVO();
             BeanUtils.copyProperties(entity, vo);
             // 拼接可访问的静态资源 URL：/static/screenshot/{fileName}
-            vo.setUrl(accessUrlPrefix + "/screenshot/" + entity.getFileName());
+            vo.setUrl(base + entity.getFileName());
             return vo;
         }).collect(Collectors.toList());
     }