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/app/api/v1/search/route.js

@@ -0,0 +1,21 @@
+import { handleSearch } from "@/sse/handlers/search.js";
+
+/**
+ * Handle CORS preflight
+ */
+export async function OPTIONS() {
+  return new Response(null, {
+    headers: {
+      "Access-Control-Allow-Origin": "*",
+      "Access-Control-Allow-Methods": "POST, OPTIONS",
+      "Access-Control-Allow-Headers": "*"
+    }
+  });
+}
+
+/**
+ * POST /v1/search - Web search endpoint
+ */
+export async function POST(request) {
+  return await handleSearch(request);
+}

src/app/api/v1/web/fetch/route.js

@@ -0,0 +1,21 @@
+import { handleFetch } from "@/sse/handlers/fetch.js";
+
+/**
+ * Handle CORS preflight
+ */
+export async function OPTIONS() {
+  return new Response(null, {
+    headers: {
+      "Access-Control-Allow-Origin": "*",
+      "Access-Control-Allow-Methods": "POST, OPTIONS",
+      "Access-Control-Allow-Headers": "*"
+    }
+  });
+}
+
+/**
+ * POST /v1/web/fetch - Web URL fetch/extract endpoint
+ */
+export async function POST(request) {
+  return await handleFetch(request);
+}