convert : add --fuse-qkv flag to fuse Q/K/V into QKV during HF-to-GGUF conversion (#22780)

convert_hf_to_gguf.py

@@ -157,6 +157,10 @@ def parse_args() -> argparse.Namespace:
         help="Store tensors dequantized from FP8 as Q8_0 instead of BF16/F16.",
     )
 
+    parser.add_argument(
+        "--fuse-qkv", action="store_true",
+        help="Fuse separate Q, K, V weight tensors into a single QKV tensor.",
+    )
     parser.add_argument(
         "--target-model-dir", type=str, default=None,
         help=(
@@ -290,6 +294,7 @@ def main() -> None:
                                      target_model_dir=Path(args.target_model_dir) if args.target_model_dir else None,
                                      fuse_gate_up_exps=args.fuse_gate_up_exps,
                                      fp8_as_q8=args.fp8_as_q8,
+                                     fuse_qkv=args.fuse_qkv,
                                      )
 
         if args.vocab_only: