Merge remote-tracking branch 'upstream/master'

# Conflicts:
#	open-sse/handlers/chatCore.js
#	open-sse/providers/registry/index.js
#	open-sse/services/usage.js

src/app/api/providers/[id]/test/testUtils.js

@@ -460,6 +460,12 @@ async function testOAuthConnection(connection, effectiveProxy = null) {
 }
 
 async function fetchWithConnectionProxy(url, options = {}, effectiveProxy = null) {
+  // Add a 15-second timeout to prevent connection testing from hanging indefinitely
+  // and exhausting the browser/Node.js connection pools.
+  if (!options.signal) {
+    options.signal = AbortSignal.timeout(15000);
+  }
+
   // Vercel relay: forward via relay URL
   if (effectiveProxy?.vercelRelayUrl) {
     const { proxyAwareFetch } = await import("open-sse/utils/proxyFetch.js");