[Kernel] Move sgl-kernel under sglang.kernels.aot (#32648)

docs_new/docs/hardware-platforms/amd_gpu.mdx

@@ -50,11 +50,11 @@ cd sglang
 
 # Compile sgl-kernel
 pip install --upgrade pip
-cd sgl-kernel
+cd python/sglang/kernels/aot
 python setup_rocm.py install
 
 # Install sglang python package along with diffusion support
-cd ..
+cd ../../../..
 rm -rf python/pyproject.toml && mv python/pyproject_other.toml python/pyproject.toml
 pip install -e "python[all_hip]"
 ```

docs_new/docs/hardware-platforms/apple_metal.mdx

@@ -36,7 +36,7 @@ source sglang-metal/bin/activate
 
 # (Optional) Compile sgl-kernel
 uv pip install --upgrade pip
-uv run sgl-kernel/setup_metal.py install
+uv run python/sglang/kernels/aot/setup_metal.py install
 
 # Install sglang python package along with diffusion support
 rm -f python/pyproject.toml && mv python/pyproject_other.toml python/pyproject.toml

docs_new/docs/hardware-platforms/cpu_server.mdx

@@ -126,7 +126,7 @@ uv pip install --upgrade pip setuptools
 uv pip install .
 
 # Build the CPU backend kernels
-cd ../sgl-kernel
+cd sglang/kernels/aot
 cp pyproject_cpu.toml pyproject.toml
 uv pip install .
 ```

docs_new/docs/hardware-platforms/mthreads_gpu.mdx

@@ -19,11 +19,11 @@ cd sglang
 
 # Compile sgl-kernel
 pip install --upgrade pip
-cd sgl-kernel
+cd python/sglang/kernels/aot
 python setup_musa.py install
 
 # Install sglang python package along with diffusion support
-cd ..
+cd ../../../..
 rm -f python/pyproject.toml && mv python/pyproject_other.toml python/pyproject.toml
 pip install -e "python[all_musa]"
 ```