jam(dev): log frame_ms + cudagraph/eager mode in buffer line

app.py

@@ -332,7 +332,8 @@ def gpu_stream(session_id):
         buf_log.append(ahead)
         if time.time() - buf_t >= 15.0 and buf_log:
             print(f"[buffer] avg={sum(buf_log)/len(buf_log):.2f}s min={min(buf_log):.2f} "
-                  f"max={max(buf_log):.2f} target={buf:.2f}s n={len(buf_log)}", flush=True)
+                  f"max={max(buf_log):.2f} target={buf:.2f}s n={len(buf_log)} "
+                  f"frame={frame_ms:.1f}ms mode={'cudagraph' if (USE_CG and cg_ok) else 'eager'}", flush=True)
             buf_log, buf_t = [], time.time()
         sleep_for = max(0.0, ahead - buf)
         cl = read_client_lead(session_id)                 # client's real Web-Audio queue (ms)