feat: add TRACE log level support across UI

Add TRACE option to log forwarding level dropdowns (AppConfig,
AgentHealth), badge color mapping, and log filter ButtonGroups
on all pages that display application logs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentInstance/AgentInstance.tsx

@@ -17,6 +17,7 @@ const LOG_LEVEL_ITEMS: ButtonGroupItem[] = [
   { value: 'warn', label: 'Warn', color: 'var(--warning)' },
   { value: 'info', label: 'Info', color: 'var(--success)' },
   { value: 'debug', label: 'Debug', color: 'var(--running)' },
+  { value: 'trace', label: 'Trace', color: 'var(--text-muted)' },
 ];
 
 function mapLogLevel(level: string): LogEntry['level'] {