refactor(ci): organize workflow into push-triggered QA and manual doc… #321

Job	Run time
C++ compile check	25s
Python lint	10s
File integrity	7s
Build — cuda (PyTorch CUDA · linux/amd64 only)	0s
Build — cpu (PyTorch CPU · linux/amd64 + arm64)	0s
Build — cpp (C++ engine · linux/amd64 + arm64)	-1s
	41s

Provide feedback