refactor(vimp): 拆分站点模型为 VimpRawSite / VimpSite 并归一化 online 字段

- 将 VimpStation 重命名为 VimpSite，统一"站点"语义贯穿全模块
- 新增 VimpRawSite 表示 /catalog/allDevice 接口原样数据，online 字段可选
- 抽离 normalizeVimpSite 纯函数，集中处理 online 字段缺失时的默认值
- catalogAllDeviceApi 入参改为 VimpRawSite[]，出参统一归一化为 VimpSite[] | null
- 下游 store、composable、树节点类型同步从 VimpStation 切换到 VimpSite
- 内部业务模型保持 online: boolean 必填，避免缺失字段沿调用链向下传播

src/pages/vimp/apis/request/catalog.all-device.ts

@@ -1,11 +1,11 @@
 import { unwrapVimpResponse, vimpClient } from '../client';
-import type { VimpStation } from '../model';
+import { normalizeVimpSite, type VimpRawSite } from '../model';
 
 export const catalogAllDeviceApi = async (options?: { signal?: AbortSignal }) => {
   const { signal } = options ?? {};
   const client = vimpClient;
   const endpoint = `/catalog/allDevice`;
-  const resp = await client.post<VimpStation[]>(endpoint, {}, { signal });
+  const resp = await client.post<VimpRawSite[]>(endpoint, {}, { signal });
   const data = unwrapVimpResponse(resp);
-  return data;
+  return data?.map(normalizeVimpSite) ?? null;
 };