feat(admin): 渠道徽章显示渠道词——付费广告/AI引用等一目了然

Co-Authored-By: Claude Code <noreply@anthropic.com>

admin/src/utils/tracker/index.ts

@@ -69,7 +69,7 @@ export function channelBadge(row: ChannelBadgeRow): string {
   if (!row.channel) return '—'
   const meta = CHANNEL_LABELS[row.channel] ?? CHANNEL_LABELS.unknown
   const platform = [row.platform, row.variant].filter(Boolean).join('·')
-  let text = `${meta.icon} ${platform || meta.label}`
+  let text = `${meta.icon} ${meta.label}${platform ? `·${platform}` : ''}`
   if (row.search_term) text += `「${row.search_term}」`
   if (row.resolution === 'label_only') text += '（标签）'
   else if (row.resolution === 'conflict') text += '（冲突）'