fix: remove duplicate sourceLabel declaration in ChatPanel

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/chat/ChatPanel.vue

@@ -43,31 +43,6 @@ function getSourceLabel(source?: string): string {
   return sourceLabel[source] || source
 }
 
-const sourceLabel: Record<string, string> = {
-  telegram: 'Telegram',
-  api_server: 'API Server',
-  cli: 'CLI',
-  discord: 'Discord',
-  slack: 'Slack',
-  matrix: 'Matrix',
-  whatsapp: 'WhatsApp',
-  signal: 'Signal',
-  email: 'Email',
-  sms: 'SMS',
-  dingtalk: 'DingTalk',
-  feishu: 'Feishu',
-  wecom: 'WeCom',
-  weixin: 'WeChat',
-  bluebubbles: 'iMessage',
-  mattermost: 'Mattermost',
-  cron: 'Cron',
-}
-
-function getSourceLabel(source?: string): string {
-  if (!source) return ''
-  return sourceLabel[source] || source
-}
-
 // Source sort order: api_server first, cron last, others alphabetical
 function sourceSortKey(source: string): number {
   if (source === 'api_server') return -1