feat: 订阅套餐展示优化、平台图标、默认月、用户订阅查询

- 新建共享平台样式模块 platform-style.ts，含各平台 SVG 图标 + 彩色 badge
- SubscriptionPlanCard 重设计：平台图标 badge、倍率/限额 grid 展示、OpenAI messages 调度信息
- UserSubscriptions 显示 group_name + 平台 badge
- ChannelCard 复用共享平台样式模块
- 管理后台：新建套餐默认 1 月、去掉模型展示、平台图标 badge、OpenAI 信息
- 管理后台用户订阅 tab 默认查询所有订阅（user_id 可选）
- Sub2API client 新增 listSubscriptions 函数
- API 返回 allowMessagesDispatch / defaultMappedModel / group_name / platform

src/app/api/subscriptions/my/route.ts

@@ -1,5 +1,5 @@
 import { NextRequest, NextResponse } from 'next/server';
-import { getCurrentUserByToken, getUserSubscriptions } from '@/lib/sub2api/client';
+import { getCurrentUserByToken, getUserSubscriptions, getAllGroups } from '@/lib/sub2api/client';
 
 export async function GET(request: NextRequest) {
   const token = request.nextUrl.searchParams.get('token')?.trim();
@@ -16,8 +16,23 @@ export async function GET(request: NextRequest) {
   }
 
   try {
-    const subscriptions = await getUserSubscriptions(userId);
-    return NextResponse.json({ subscriptions });
+    const [subscriptions, groups] = await Promise.all([
+      getUserSubscriptions(userId),
+      getAllGroups().catch(() => []),
+    ]);
+
+    const groupMap = new Map(groups.map((g) => [g.id, g]));
+
+    const enriched = subscriptions.map((sub) => {
+      const group = groupMap.get(sub.group_id);
+      return {
+        ...sub,
+        group_name: group?.name ?? null,
+        platform: group?.platform ?? null,
+      };
+    });
+
+    return NextResponse.json({ subscriptions: enriched });
   } catch (error) {
     console.error('Failed to get user subscriptions:', error);
     return NextResponse.json({ error: '获取订阅信息失败' }, { status: 500 });