fix(runtime-fallback): match Volcano Engine 'exceeded the usage quota' errors

Volcano Engine sends quota exceeded errors with the words in reverse
order: 'You have exceeded the 5-hour usage quota'. The existing
patterns required 'quota' to precede 'exceeded', so they never matched.

- Add /exceeded.*quota/i and /usage.?quota/i to RETRYABLE_ERROR_PATTERNS
- Add exceeded.*quota and usage\s*quota to AUTO_RETRY_PATTERNS
- Add regression tests for both detection paths

Fixes: runtime-fallback not triggering on Volcano Engine quota errors

src/hooks/runtime-fallback/constants.ts

@@ -27,6 +27,8 @@ export const RETRYABLE_ERROR_PATTERNS = [
   /too.?many.?requests/i,
   /quota\s+will\s+reset\s+after/i,
   /quota.?exceeded/i,
+  /exceeded.*quota/i,
+  /usage.?quota/i,
   /exhausted\s+your\s+capacity/i,
   /all\s+credentials\s+for\s+model/i,
   /cool(?:ing)?\s+down/i,