feat(usage): implement timeout and error handling for antigravity usage and subscription requests

- Add a 10-second timeout for fetch requests in getAntigravityUsage and getAntigravitySubscriptionInfo functions.
- Include error logging for fetch failures in both functions.
- Update headers to include "x-request-source" for MITM bypass.
- Enhance proxyFetch with DNS resolution and MITM bypass capabilities.
- Ensure proxyFetch is loaded in the API route for proper fetch patching.

src/app/api/usage/[connectionId]/route.js

@@ -1,3 +1,6 @@
+// Ensure proxyFetch is loaded to patch globalThis.fetch
+import "open-sse/index.js";
+
 import { getProviderConnectionById, updateProviderConnection } from "@/lib/localDb";
 import { getUsageForProvider } from "open-sse/services/usage.js";
 import { getExecutor } from "open-sse/executors/index.js";

src/lib/oauth/providers.js

@@ -261,12 +261,16 @@ const PROVIDERS = {
         "User-Agent": ANTIGRAVITY_CONFIG.loadCodeAssistUserAgent,
         "X-Goog-Api-Client": ANTIGRAVITY_CONFIG.loadCodeAssistApiClient,
         "Client-Metadata": ANTIGRAVITY_CONFIG.loadCodeAssistClientMetadata,
+        "x-request-source": "local", // MITM passthrough marker
       };
       const metadata = getOAuthClientMetadata();
 
       // Fetch user info
       const userInfoRes = await fetch(`${ANTIGRAVITY_CONFIG.userInfoUrl}?alt=json`, {
-        headers: { Authorization: `Bearer ${tokens.access_token}` },
+        headers: { 
+          Authorization: `Bearer ${tokens.access_token}`,
+          "x-request-source": "local", // MITM passthrough marker
+        },
       });
       const userInfo = userInfoRes.ok ? await userInfoRes.json() : {};
 

src/mitm/server.js

@@ -201,20 +201,17 @@ const server = https.createServer(sslOptions, async (req, res) => {
   }
 
   const model = extractModel(req.url, bodyBuffer);
-  console.log(`📡 intercepted: ${req.url} | model: ${model}`);
   const mappedModel = getMappedModel(model);
 
   if (!mappedModel) {
     return passthrough(req, res, bodyBuffer);
   }
 
-  console.log(`🔀 ${model} → ${mappedModel}`);
   return intercept(req, res, bodyBuffer, mappedModel);
 });
 
 server.listen(LOCAL_PORT, () => {
-  console.log(`🚀 MITM ready on :${LOCAL_PORT} → ${ROUTER_URL}`);
-  console.log(`📡 Intercepting: ${TARGET_HOSTS.join(", ")}`);
+  console.log(`🚀 MITM ready on :${LOCAL_PORT}`);
 });
 
 server.on("error", (error) => {