feat(kimi-desktop): strengthen the internal-build tag wording

Change the sidebar tag to 'Internal testing · do not distribute' /
'内部测试 · 禁止外传' so the no-distribution intent is explicit.

apps/kimi-web/src/i18n/locales/en/app.ts

@@ -6,5 +6,5 @@ export default {
   authPageLogin: 'Sign in',
   connecting: 'Connecting…',
   comingSoon: 'Coming soon…',
-  internalBuildBanner: 'Internal testing build',
+  internalBuildBanner: 'Internal testing · do not distribute',
 } as const;

apps/kimi-web/src/i18n/locales/zh/app.ts

@@ -6,5 +6,5 @@ export default {
   authPageLogin: '登录',
   connecting: '连接中…',
   comingSoon: '敬请期待',
-  internalBuildBanner: '内部测试版本',
+  internalBuildBanner: '内部测试 · 禁止外传',
 } as const;