fix(device): 设备示意图改为模块导入并清理残留死代码

- 设备示意图改用 import 引入，避免生产构建后 /src/assets 路径 404
- SSE 改为直接引用 @/utils/sse，还原上游 composables 入口
- 移除已失效的 /static 代理与未被调用的 DeviceAPI.getInfo

src/views/devices/sn/index.vue

@@ -106,7 +106,7 @@ import { onBeforeUnmount, ref } from "vue";
 import DeviceAPI from "@/api/device";
 import type { DeviceOnlineVO } from "@/api/device/types";
 import type { IObject, PageModalInstance } from "./components/types";
-import { useSse } from "@/composables";
+import { useSse } from "@/utils/sse";
 import DevicePageContent from "./components/DevicePageContent.vue";
 import DevicePageModal from "./components/DevicePageModal.vue";
 import DevicePageSearch from "./components/DevicePageSearch.vue";