Enhance token refresh functionality across multiple executors

- Updated refreshCredentials methods in various executors (Antigravity, Base, Default, Github, Kiro) to accept optional proxyOptions for improved proxy handling.
- Modified token refresh logic to utilize proxy-aware fetch for better network management.
- Enhanced usage retrieval functions to support proxy options, ensuring seamless integration with proxy configurations.
- Updated ModelSelectModal and ProviderInfoCard components to incorporate kind filtering for improved user experience in model selection.
- Added validation for API keys in the provider validation route, including support for webSearch/webFetch providers.

open-sse/executors/base.js

@@ -85,7 +85,7 @@ export class BaseExecutor {
   }
 
   // Override in subclass for provider-specific refresh
-  async refreshCredentials(credentials, log) {
+  async refreshCredentials(credentials, log, proxyOptions = null) {
     return null;
   }