Upgrade to Claude Sonnet 4.5 model

- Update model from deprecated claude-3-5-sonnet-20241022 to claude-sonnet-4-5
- Claude 3.5 Sonnet was deprecated in November 2025
- Claude Sonnet 4.5 offers better performance, especially for coding tasks
- Rebuild dist/index.js with updated model

dist/index.js

@@ -32134,7 +32134,7 @@ ${diffContent}
           'anthropic-version': '2023-06-01'
         },
         body: JSON.stringify({
-          model: 'claude-3-5-sonnet-20241022',
+          model: 'claude-sonnet-4-5',
           max_tokens: 4096,
           temperature: 0.7,
           messages: [{