fix(error-classifier): classify credit balance too low as quota_exceeded for fallback (fixes #3571)

src/hooks/runtime-fallback/error-classifier.ts

@@ -132,7 +132,8 @@ export function classifyErrorType(error: unknown): string | undefined {
     /exhausted\s+your\s+capacity/i.test(message) ||
     /out\s+of\s+credits?/i.test(message) ||
     /payment.?required/i.test(message) ||
-    /usage\s+limit/i.test(message)
+    /usage\s+limit/i.test(message) ||
+    /credit\s+balance.*too\s+low/i.test(message)
   ) {
     return "quota_exceeded"
   }