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/antigravity.js

@@ -114,11 +114,11 @@ export class AntigravityExecutor extends BaseExecutor {
     };
   }
 
-  async refreshCredentials(credentials, log) {
+  async refreshCredentials(credentials, log, proxyOptions = null) {
     if (!credentials.refreshToken) return null;
 
     try {
-      const response = await fetch(OAUTH_ENDPOINTS.google.token, {
+      const response = await proxyAwareFetch(OAUTH_ENDPOINTS.google.token, {
         method: "POST",
         headers: { "Content-Type": "application/x-www-form-urlencoded", "Accept": "application/json" },
         body: new URLSearchParams({
@@ -127,7 +127,7 @@ export class AntigravityExecutor extends BaseExecutor {
           client_id: this.config.clientId,
           client_secret: this.config.clientSecret
         })
-      });
+      }, proxyOptions);
 
       if (!response.ok) return null;