add installation of uv

Signed-off-by: Gaohan123 <gaohan19@huawei.com>

README.md

@@ -47,6 +47,7 @@ docker run --gpus all --ipc=host --network=host -v $source_dir:$container_dir --
 
 Set up basic uv environment
 ```bash
+pip install uv
 uv venv --python 3.12 --seed
 source .venv/bin/activate
 ```

examples/offline_inference/qwen_2_5_omni/README.md

@@ -11,6 +11,7 @@ docker run --gpus all --ipc=host --network=host -v $source_dir:$container_dir --
 
 Set up basic uv environment
 ```bash
+pip install uv
 uv venv --python 3.12 --seed
 source .venv/bin/activate
 ```