feat(admin): 时间线业务事件徽章+询盘漏斗卡+付费社交渠道标签（含server时间线安全字段）

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

admin/src/utils/tracker/index.ts

@@ -43,6 +43,7 @@ export const countryFlag = (country?: string | null): string =>
 export const CHANNEL_LABELS: Record<string, { label: string; icon: string; color: string }> = {
   natural_search: { label: '自然搜索', icon: '🔍', color: '#409EFF' },
   paid_search: { label: '付费广告', icon: '💰', color: '#F56C6C' },
+  paid_social: { label: '付费社交', icon: '📣', color: '#F759AB' },   // 归因 v2：fbclid / fb 家族+付费 medium
   ai_referral: { label: 'AI 引用', icon: '🤖', color: '#9B59B6' },
   social: { label: '社交媒体', icon: '💬', color: '#E6A23C' },
   in_app: { label: '应用内', icon: '📱', color: '#67C23A' },