fix: 修复 USER_TYPE=ant 时 TUI 无法启动的问题

反编译版本中 global.d.ts 声明的全局函数运行时未定义，
通过显式 import、stub 组件和全局 polyfill 修复。

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

src/utils/thinking.ts

@@ -6,6 +6,7 @@ import { getCanonicalName } from './model/model.js'
 import { get3PModelCapabilityOverride } from './model/modelSupportOverrides.js'
 import { getAPIProvider } from './model/providers.js'
 import { getSettingsWithErrors } from './settings/settings.js'
+import { resolveAntModel } from './model/antModels.js'
 
 export type ThinkingConfig =
   | { type: 'adaptive' }