fix: add missing CMakeLists.txt for KT-SFT

[yuxuan-z19]

Adds the missing CMakeLists.txt for KT-SFT/csrc/ktransformers_ext (previously ignored due to a .gitignore typo). Tested under the environment from issue #1563.

[gemini-code-assist[bot]]

Summary of Changes

Hello @yuxuan-z19, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical build issue by fixing a .gitignore entry that was inadvertently excluding a necessary CMakeLists.txt file. It then introduces this newly tracked CMake configuration, which provides a flexible and comprehensive build system for the ktransformers_ext module, supporting a wide array of hardware architectures and acceleration backends. The accompanying install.sh script has also been updated to ensure smooth and correct installation of dependencies and the module itself, leveraging the new build setup.

Highlights

• CMakeLists.txt Inclusion: Corrected a .gitignore typo to ensure the CMakeLists.txt for KT-SFT/csrc/ktransformers_ext is properly tracked and included in the repository.
• New Build Configuration: Introduced a comprehensive CMakeLists.txt for ktransformers_ext, enabling robust build configurations for various CPU architectures (ARM, x86 with AVX, AVX2, AVX512, AMX) and GPU backends (CUDA, MUSA, ROCM, XPU, NPU).
• Installation Script Update: Modified install.sh to use CWD for reliable path resolution and updated dependency installation to requirements-sft.txt and correct module paths.

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[JimmyPeilinLi]

Thank you for your reminder. It was a very effective PR.