TensorStudio 1.14.0

TensorStudio 1.14.0 completes the safe, testable Hardware Backends roadmap batch. It adds native CPU/CUDA/Metal device descriptors, backend availability metadata, explicit transfer APIs, device-aware storage validation, tensor factory device keywords, backend benchmark coverage, CMake CUDA/Metal metadata hooks, and hardware docs. Published wheels remain honest CPU-only builds: CUDA and Metal execution kernels are deferred until accelerator builds and CI can validate them. Validated locally with ruff, mypy, pytest, test_all with artifact smoke, strict MkDocs, benchmark thresholds, official build, twine check, and clean wheel/sdist verification.