feat: release contextual omnichannel customer platform

Add Telegram, WhatsApp and email account management, realtime messaging, contextual multilingual AI, customer intelligence, knowledge workflows, enterprise controls, a unified design system and complete repository documentation.

src/config/constants.ts

@@ -26,7 +26,18 @@ export const COUNTRIES: CountryMeta[] = [
 ]
 
 export function countryMeta(code: string): CountryMeta {
-  return COUNTRIES.find((c) => c.code === code) ?? { code, zh: code, en: code, flag: '🏳️', tzOffset: 0, lang: 'en' }
+  const normalized = String(code || '').trim().toUpperCase()
+  const known = COUNTRIES.find((c) => c.code === normalized)
+  if (known) return known
+  if (!/^[A-Z]{2}$/.test(normalized)) {
+    return { code: '', zh: '国家待确认', en: 'Country not confirmed', flag: '🌐', tzOffset: Number.NaN, lang: '' }
+  }
+  const flag = String.fromCodePoint(
+    ...[...normalized].map((character) => 127397 + character.charCodeAt(0)),
+  )
+  const zh = new Intl.DisplayNames(['zh-CN'], { type: 'region' }).of(normalized) || normalized
+  const en = new Intl.DisplayNames(['en'], { type: 'region' }).of(normalized) || normalized
+  return { code: normalized, zh, en, flag, tzOffset: Number.NaN, lang: '' }
 }
 
 /** 行业 */