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/admin/subscriptions/route.ts

@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server';
 import { verifyAdminToken, unauthorizedResponse } from '@/lib/admin-auth';
-import { getUserSubscriptions, getUser } from '@/lib/sub2api/client';
+import { getUserSubscriptions, getUser, listSubscriptions } from '@/lib/sub2api/client';
 
 export async function GET(request: NextRequest) {
   if (!(await verifyAdminToken(request))) return unauthorizedResponse(request);
@@ -8,30 +8,47 @@ export async function GET(request: NextRequest) {
   try {
     const searchParams = request.nextUrl.searchParams;
     const userId = searchParams.get('user_id');
-
-    if (!userId) {
-      return NextResponse.json({ error: '缺少必填参数: user_id' }, { status: 400 });
-    }
-
-    const parsedUserId = Number(userId);
-    if (!Number.isFinite(parsedUserId) || parsedUserId <= 0) {
-      return NextResponse.json({ error: '无效的 user_id' }, { status: 400 });
-    }
-
-    const [subscriptions, user] = await Promise.all([
-      getUserSubscriptions(parsedUserId),
-      getUser(parsedUserId).catch(() => null),
-    ]);
-
-    // 如果提供了 group_id 筛选，过滤结果
     const groupId = searchParams.get('group_id');
-    const filtered = groupId
-      ? subscriptions.filter((s) => s.group_id === Number(groupId))
-      : subscriptions;
+    const status = searchParams.get('status');
+    const page = searchParams.get('page');
+    const pageSize = searchParams.get('page_size');
+
+    if (userId) {
+      // 按用户查询（原有逻辑）
+      const parsedUserId = Number(userId);
+      if (!Number.isFinite(parsedUserId) || parsedUserId <= 0) {
+        return NextResponse.json({ error: '无效的 user_id' }, { status: 400 });
+      }
+
+      const [subscriptions, user] = await Promise.all([
+        getUserSubscriptions(parsedUserId),
+        getUser(parsedUserId).catch(() => null),
+      ]);
+
+      const filtered = groupId
+        ? subscriptions.filter((s) => s.group_id === Number(groupId))
+        : subscriptions;
+
+      return NextResponse.json({
+        subscriptions: filtered,
+        user: user ? { id: user.id, username: user.username, email: user.email } : null,
+      });
+    }
+
+    // 无 user_id 时列出所有订阅
+    const result = await listSubscriptions({
+      group_id: groupId ? Number(groupId) : undefined,
+      status: status || undefined,
+      page: page ? Number(page) : undefined,
+      page_size: pageSize ? Number(pageSize) : undefined,
+    });
 
     return NextResponse.json({
-      subscriptions: filtered,
-      user: user ? { id: user.id, username: user.username, email: user.email } : null,
+      subscriptions: result.subscriptions,
+      total: result.total,
+      page: result.page,
+      page_size: result.page_size,
+      user: null,
     });
   } catch (error) {
     console.error('Failed to query subscriptions:', error);