[zhangzhenghao]

Summary

• Rename the public Python and C++ Model class to CLAP, and text / audio to encode_text / encode_audio.
• Add Python encode_audio(path, crop_offset=0) for str and pathlib.Path, with native file decoding, mono downmixing and automatic model-rate resampling; retain PCM input support.
• Remove Python's public decode_audio and resample_audio helpers; keep the native C++ helpers available.
• Migrate native CLI/server callers, architecture test consumers and documentation. No legacy aliases are retained.

Verification

• Built the CPU wheel through the default sdist-to-wheel python -m build python path, installed that wheel, and passed 51 Python integration tests.
• Passed 26/26 CTest tests in each of static and shared Linux CPU builds.
• Syntax-checked all migrated optional C++ architecture-test consumers.
• Inspected wheel contents/licenses and ldd: no external ggml/ICU/OpenMP dependencies.
• Independent review: no blocking security or correctness findings.
• Unicode str/Path audio paths, stereo downmixing, non-native sample rate, crop offsets, missing/invalid files, closed handles and existing PCM/text behavior covered.
• Local verification is Linux CPU only; GPU runtime behavior was not exercised.

Remote CI (5487508)

• Python wheel build/install/tests passed on Linux x64, Linux ARM64, macOS and Windows x64.
• Native build/test/install passed on Linux x64, Linux ARM64, macOS and Windows x64.
• Native Windows ARM64 failed before compilation while generating audio fixtures: the installed yt-dlp FFmpeg crashes converting mono.wav to mono.flac with exit code 3221225477. The base main run 40102240289 at 519a84e fails at the identical command with the identical exit code. This is a pre-existing FFmpeg/tooling failure, not introduced by this API migration; workflow and fixture-generator files are unchanged.