feat: 渠道/订阅管理UI优化 — 平台图标、布局改善、分组信息卡片

- 渠道管理：平台列用 PlatformBadge 带图标，分类下拉显示 label
- 渠道管理：添加 antigravity/anthropic 平台选项
- 订阅管理：/v1/messages 调度改为"已启用/未启用"文字
- 订阅管理：编辑 modal 选择分组后展示只读分组信息卡片
- 订阅管理：有效期+单位独立一行，排序单独一行

src/app/admin/channels/page.tsx

@@ -4,6 +4,7 @@ import { useSearchParams } from 'next/navigation';
 import { useState, useEffect, useCallback, Suspense } from 'react';
 import PayPageLayout from '@/components/PayPageLayout';
 import { resolveLocale, type Locale } from '@/lib/locale';
+import { PlatformBadge, getPlatformStyle } from '@/lib/platform-style';
 
 // ── Types ──
 
@@ -44,15 +45,7 @@ interface ChannelFormData {
   enabled: boolean;
 }
 
-const PLATFORMS = ['claude', 'openai', 'gemini', 'codex', 'sora'] as const;
-
-const PLATFORM_COLORS: Record<string, { bg: string; text: string }> = {
-  claude: { bg: 'bg-orange-100 dark:bg-orange-900/40', text: 'text-orange-700 dark:text-orange-300' },
-  openai: { bg: 'bg-green-100 dark:bg-green-900/40', text: 'text-green-700 dark:text-green-300' },
-  gemini: { bg: 'bg-blue-100 dark:bg-blue-900/40', text: 'text-blue-700 dark:text-blue-300' },
-  codex: { bg: 'bg-purple-100 dark:bg-purple-900/40', text: 'text-purple-700 dark:text-purple-300' },
-  sora: { bg: 'bg-pink-100 dark:bg-pink-900/40', text: 'text-pink-700 dark:text-pink-300' },
-};
+const PLATFORMS = ['claude', 'anthropic', 'openai', 'gemini', 'codex', 'sora', 'antigravity'] as const;
 
 // ── i18n ──
 
@@ -706,7 +699,6 @@ function ChannelsContent() {
             </thead>
             <tbody>
               {channels.map((channel) => {
-                const pc = PLATFORM_COLORS[channel.platform] ?? PLATFORM_COLORS.claude;
                 return (
                   <tr
                     key={channel.id}
@@ -722,11 +714,7 @@ function ChannelsContent() {
                       </div>
                     </td>
                     <td className="px-4 py-3">
-                      <span
-                        className={`inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-medium ${isDark ? pc.bg.replace('dark:', '') : pc.bg.split(' ')[0]} ${isDark ? pc.text.replace('dark:', '') : pc.text.split(' ')[0]}`}
-                      >
-                        {channel.platform}
-                      </span>
+                      <PlatformBadge platform={channel.platform} />
                     </td>
                     <td className={`px-4 py-3 ${isDark ? 'text-slate-300' : 'text-slate-700'}`}>
                       {channel.rateMultiplier}x
@@ -849,7 +837,7 @@ function ChannelsContent() {
                 >
                   {PLATFORMS.map((p) => (
                     <option key={p} value={p}>
-                      {p}
+                      {getPlatformStyle(p).label || p}
                     </option>
                   ))}
                 </select>
@@ -1019,16 +1007,7 @@ function ChannelsContent() {
                           <span className={`text-xs ${isDark ? 'text-slate-500' : 'text-slate-400'}`}>
                             #{group.id}
                           </span>
-                          {(() => {
-                            const gpc = PLATFORM_COLORS[group.platform] ?? PLATFORM_COLORS.claude;
-                            return (
-                              <span
-                                className={`inline-flex items-center rounded-full px-2 py-0.5 text-[10px] font-medium ${isDark ? gpc.bg.replace('dark:', '') : gpc.bg.split(' ')[0]} ${isDark ? gpc.text.replace('dark:', '') : gpc.text.split(' ')[0]}`}
-                              >
-                                {group.platform}
-                              </span>
-                            );
-                          })()}
+                          <PlatformBadge platform={group.platform} className="text-[10px]" />
                           {alreadyImported && (
                             <span className="text-[10px] text-amber-500 font-medium">{t.syncAlreadyExists}</span>
                           )}

src/app/admin/subscriptions/page.tsx

@@ -918,22 +918,15 @@ function SubscriptionsContent() {
                         {plan.groupPlatform?.toLowerCase() === 'openai' && (
                           <>
                             <div>
-                              <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>/v1/messages</span>
-                              <div className="mt-0.5">
-                                <span className={[
-                                  'inline-block rounded-full px-1.5 py-0.5 text-[10px] font-medium',
-                                  plan.groupAllowMessagesDispatch
-                                    ? isDark ? 'bg-green-500/20 text-green-300' : 'bg-green-50 text-green-700'
-                                    : isDark ? 'bg-slate-700 text-slate-400' : 'bg-slate-100 text-slate-500',
-                                ].join(' ')}>
-                                  {plan.groupAllowMessagesDispatch ? '✓' : '✗'}
-                                </span>
+                              <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>/v1/messages 调度</span>
+                              <div className={['mt-0.5 text-xs font-medium', plan.groupAllowMessagesDispatch ? 'text-green-600 dark:text-green-400' : isDark ? 'text-slate-400' : 'text-slate-500'].join(' ')}>
+                                {plan.groupAllowMessagesDispatch ? '已启用' : '未启用'}
                               </div>
                             </div>
                             {plan.groupDefaultMappedModel && (
                               <div className="sm:col-span-2">
                                 <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>默认模型</span>
-                                <div className={['font-mono text-[10px]', isDark ? 'text-slate-300' : 'text-slate-600'].join(' ')}>
+                                <div className={['mt-0.5 font-mono text-xs', isDark ? 'text-slate-300' : 'text-slate-600'].join(' ')}>
                                   {plan.groupDefaultMappedModel}
                                 </div>
                               </div>
@@ -1199,6 +1192,64 @@ function SubscriptionsContent() {
                 </select>
               </div>
 
+              {/* Selected group info card (read-only) */}
+              {(() => {
+                const selectedGroup = groups.find((g) => String(g.id) === formGroupId);
+                if (!selectedGroup) return null;
+                return (
+                  <div className={['rounded-lg border p-3 text-xs', isDark ? 'border-slate-700 bg-slate-800/60' : 'border-slate-200 bg-slate-50'].join(' ')}>
+                    <div className="flex items-center gap-2 mb-2">
+                      <span className={['font-medium', isDark ? 'text-slate-300' : 'text-slate-600'].join(' ')}>
+                        {t.groupInfo}
+                      </span>
+                      <span className={['text-[10px]', isDark ? 'text-slate-500' : 'text-slate-400'].join(' ')}>
+                        {t.groupInfoReadonly}
+                      </span>
+                    </div>
+                    <div className="grid grid-cols-2 gap-x-4 gap-y-2">
+                      {selectedGroup.platform && (
+                        <div>
+                          <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>{t.platform}</span>
+                          <div className="mt-0.5"><PlatformBadge platform={selectedGroup.platform} /></div>
+                        </div>
+                      )}
+                      {selectedGroup.rate_multiplier != null && (
+                        <div>
+                          <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>{t.rateMultiplier}</span>
+                          <div className={isDark ? 'text-slate-300' : 'text-slate-600'}>{selectedGroup.rate_multiplier}x</div>
+                        </div>
+                      )}
+                      <div>
+                        <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>{t.dailyLimit}</span>
+                        <div className={isDark ? 'text-slate-300' : 'text-slate-600'}>
+                          {selectedGroup.daily_limit_usd != null ? `$${selectedGroup.daily_limit_usd}` : t.unlimited}
+                        </div>
+                      </div>
+                      <div>
+                        <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>{t.weeklyLimit}</span>
+                        <div className={isDark ? 'text-slate-300' : 'text-slate-600'}>
+                          {selectedGroup.weekly_limit_usd != null ? `$${selectedGroup.weekly_limit_usd}` : t.unlimited}
+                        </div>
+                      </div>
+                      <div>
+                        <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>{t.monthlyLimit}</span>
+                        <div className={isDark ? 'text-slate-300' : 'text-slate-600'}>
+                          {selectedGroup.monthly_limit_usd != null ? `$${selectedGroup.monthly_limit_usd}` : t.unlimited}
+                        </div>
+                      </div>
+                      {selectedGroup.platform?.toLowerCase() === 'openai' && (
+                        <div>
+                          <span className={isDark ? 'text-slate-500' : 'text-slate-400'}>/v1/messages 调度</span>
+                          <div className={['mt-0.5 font-medium', selectedGroup.allow_messages_dispatch ? 'text-green-600 dark:text-green-400' : isDark ? 'text-slate-400' : 'text-slate-500'].join(' ')}>
+                            {selectedGroup.allow_messages_dispatch ? '已启用' : '未启用'}
+                          </div>
+                        </div>
+                      )}
+                    </div>
+                  </div>
+                );
+              })()}
+
               {/* Name */}
               <div>
                 <label className={labelCls}>{t.fieldName} *</label>
@@ -1251,8 +1302,8 @@ function SubscriptionsContent() {
                 </div>
               </div>
 
-              {/* Valid days + Unit + Sort */}
-              <div className="grid grid-cols-3 gap-3">
+              {/* Valid days + Unit */}
+              <div className="grid grid-cols-2 gap-3">
                 <div>
                   <label className={labelCls}>{t.fieldValidDays}</label>
                   <input
@@ -1275,15 +1326,17 @@ function SubscriptionsContent() {
                     <option value="month">{t.unitMonth}</option>
                   </select>
                 </div>
-                <div>
-                  <label className={labelCls}>{t.fieldSortOrder}</label>
-                  <input
-                    type="number"
-                    value={formSortOrder}
-                    onChange={(e) => setFormSortOrder(e.target.value)}
-                    className={inputCls}
-                  />
-                </div>
+              </div>
+
+              {/* Sort Order */}
+              <div>
+                <label className={labelCls}>{t.fieldSortOrder}</label>
+                <input
+                  type="number"
+                  value={formSortOrder}
+                  onChange={(e) => setFormSortOrder(e.target.value)}
+                  className={inputCls}
+                />
               </div>
 
               {/* Features */}