Time log_inference and print elapsed duration

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

logging_utils.py

@@ -150,6 +150,8 @@ def _prune_old_files(api, repo_id, keep_days, now):
 
 def log_inference(pil_inputs, output_pil, prompt, seed, steps, guidance_scale,
                   input_width, input_height, duration_seconds, success, error_message=""):
+    import time as _time
+    _t0 = _time.perf_counter()
     if not HF_TOKEN or not DATASET_REPO:
         print(f"[log] skipped — HF_TOKEN={'set' if HF_TOKEN else 'missing'}, DATASET_REPO={'set' if DATASET_REPO else 'missing'}")
         return
@@ -171,3 +173,5 @@ def log_inference(pil_inputs, output_pil, prompt, seed, steps, guidance_scale,
     except Exception as log_err:
         import traceback as _tb
         print(f"[log] WARNING: {log_err}\n{_tb.format_exc()}")
+    finally:
+        print(f"[log] log_inference took {_time.perf_counter() - _t0:.3f}s")