feat(cli): improve auth dialog UX with clearer three-option layout

- Replace nested API-KEY submenu with flat three-option layout
- Add descriptive labels for each authentication method:
  - Qwen OAuth: Free, up to 1,000 requests/day
  - Alibaba Cloud Coding Plan: Paid, multiple model providers
  - API Key: Bring your own API key
- Simplify region selection for Coding Plan (China vs Global)
- Use DescriptiveRadioButtonSelect for better visual hierarchy
- Add itemGap prop to BaseSelectionList for spacing
- Update i18n strings in en.js, zh.js, and ru.js
- Simplify custom API key configuration info view
- Clean up unused region-specific strings

Closes #2016

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/cli/src/ui/components/ApiKeyInput.tsx

@@ -57,9 +57,6 @@ export function ApiKeyInput({
 
   return (
     <Box flexDirection="column">
-      <Box marginBottom={1}>
-        <Text>{t('Please enter your API key:')}</Text>
-      </Box>
       <TextInput value={apiKey} onChange={setApiKey} placeholder="sk-sp-..." />
       {error && (
         <Box marginTop={1}>
@@ -67,18 +64,18 @@ export function ApiKeyInput({
         </Box>
       )}
       <Box marginTop={1}>
-        <Text>{t('You can get your exclusive Coding Plan API-KEY here:')}</Text>
+        <Text>{t('You can get your Coding Plan API key here')}</Text>
       </Box>
       <Box marginTop={0}>
         <Link url={apiKeyUrl} fallback={false}>
-          <Text color={theme.status.success} underline>
+          <Text color={theme.text.link} underline>
             {apiKeyUrl}
           </Text>
         </Link>
       </Box>
       <Box marginTop={1}>
         <Text color={theme.text.secondary}>
-          {t('(Press Enter to submit, Escape to cancel)')}
+          {t('Enter to submit, Esc to go back')}
         </Text>
       </Box>
     </Box>