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.

src/lib/localDb.js

@@ -582,6 +582,7 @@ export async function createCombo(data) {
     id: uuidv4(),
     name: data.name,
     models: data.models || [],
+    kind: data.kind || null,
     createdAt: now,
     updatedAt: now,
   };