fix: 修复多项关键 Bug，与 openclaw 上游协议对齐

- main.js: wsClient.connect 传参格式错误（完整 ws:// URL → host:port）
- ws-client.js: request() 等待重连时不处理 onReady 握手失败
- gateway.js: bind 写入非法值 'all'，改为 openclaw 合法值 'lan'
- device.rs: connect payload 从 v2 升级到 v3，补充 platform/deviceFamily
- config.rs: macOS reload_gateway 在 async fn 中用同步 Command 阻塞 tokio
- service.rs: Windows check_service_status 端口硬编码 18789，改为读配置
- extensions.rs: parse_cftunnel_status 全角冒号解析失败，添加 split_after_colon
- tauri-api.js: cachedInvoke miss 时 logRequest 被记录两次
- tauri-api.js: mock 补充 list_agents / restart_gateway
- chat.js: 附件对象冗余 data 字段（双倍内存）+ 缩进修复
- services.js: 服务操作缺少操作中 toast 反馈

src/style/chat.css

@@ -548,3 +548,66 @@
 .cmd-desc {
   color: var(--text-secondary);
 }
+
+/* 文件上传 */
+.chat-attach-btn {
+  background: none;
+  border: none;
+  color: var(--text-secondary);
+  cursor: pointer;
+  padding: 8px;
+  border-radius: 4px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.2s;
+}
+
+.chat-attach-btn:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.chat-attachments-preview {
+  display: flex;
+  gap: 8px;
+  padding: 8px;
+  flex-wrap: wrap;
+}
+
+.chat-attachment-item {
+  position: relative;
+  width: 80px;
+  height: 80px;
+  border-radius: 6px;
+  overflow: hidden;
+  border: 1px solid var(--border);
+}
+
+.chat-attachment-item img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+
+.chat-attachment-del {
+  position: absolute;
+  top: 2px;
+  right: 2px;
+  background: rgba(0,0,0,0.6);
+  color: white;
+  border: none;
+  border-radius: 50%;
+  width: 20px;
+  height: 20px;
+  cursor: pointer;
+  font-size: 14px;
+  line-height: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.chat-attachment-del:hover {
+  background: rgba(255,0,0,0.8);
+}