fix(sub2api): 分组列表不再按 platform 过滤

- list_remote_groups 去掉 platform=openai 查询参数，拉取全部分组
- 返回 DTO 增加 platform 字段
- 前端下拉项显示 platform 标签，方便用户识别（如 openai / claude / gemini）

Why: sub2api 的分组有严格平台字段，若用户只建了 Claude 分组或跨平台分组会被过滤为空。让前端列出全部，由用户自行选择。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

services/sub2api_service.py

@@ -325,7 +325,6 @@ def list_remote_groups(server: dict) -> list[dict]:
                 f"{base_url.rstrip('/')}/api/v1/admin/groups",
                 headers=headers,
                 params={
-                    "platform": "openai",
                     "page": page,
                     "page_size": 200,
                 },
@@ -349,6 +348,7 @@ def list_remote_groups(server: dict) -> list[dict]:
                     "id": str(group_id),
                     "name": _clean(group.get("name")),
                     "description": _clean(group.get("description")),
+                    "platform": _clean(group.get("platform")),
                     "status": _clean(group.get("status")),
                     "account_count": int(group.get("account_count") or 0),
                     "active_account_count": int(group.get("active_account_count") or 0),

web/src/app/settings/components/sub2api-connections.tsx

@@ -205,7 +205,7 @@ export function Sub2APIConnections() {
       const data = await fetchSub2APIServerGroups(editingServer.id);
       setRemoteGroups(data.groups);
       if (data.groups.length === 0) {
-        toast.message("远端没有 platform=openai 的分组");
+        toast.message("远端没有配置分组");
       } else {
         toast.success(`读取到 ${data.groups.length} 个分组`);
       }
@@ -667,8 +667,9 @@ export function Sub2APIConnections() {
                     {remoteGroups.map((group) => (
                       <SelectItem key={group.id} value={group.id}>
                         {group.name || `Group ${group.id}`}
+                        {group.platform ? `（${group.platform}）` : ""}
                         {group.account_count
-                          ? `（${group.active_account_count}/${group.account_count}）`
+                          ? ` · ${group.active_account_count}/${group.account_count}`
                           : ""}
                       </SelectItem>
                     ))}

web/src/lib/api.ts

@@ -233,6 +233,7 @@ export type Sub2APIRemoteGroup = {
   id: string;
   name: string;
   description: string;
+  platform: string;
   status: string;
   account_count: number;
   active_account_count: number;