analyzer: make http3/quic handling more reliable

analyzer/udp/internal/quic/payload.go

@@ -270,6 +270,11 @@ func extractCryptoFrames(r *bytes.Reader) ([]CryptoFrame, error) {
 				return nil, err
 			}
 		default:
+			// Unknown/extension frame type: if we already collected CRYPTO
+			// frames, return them instead of failing hard.
+			if len(frames) > 0 {
+				return frames, nil
+			}
 			return nil, fmt.Errorf("unsupported frame type: %d", typ)
 		}
 	}