chore: switch project license to MIT

[OneNoted]

Summary

• switch the project license text and manifest metadata to MIT
• add root crate author metadata and update license docs/notices
• change the vendored whisper-rs-sys fork metadata to MIT and add an explicit vendor MIT license file

Verification

• cargo metadata --no-deps --format-version 1
• cargo metadata --manifest-path vendor/whisper-rs-sys/Cargo.toml --no-deps --format-version 1
• cargo package --allow-dirty --no-verify --list
• cargo package --manifest-path vendor/whisper-rs-sys/Cargo.toml --allow-dirty --no-verify --list
• repo-wide scan for stale MPL/Unlicense references

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Correct vendor license statement in NOTICE

The updated notice says all bundled code under vendor/whisper-rs-sys is MIT, but the vendored tree contains additional license markers (for example ggml-sycl/* files include SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception, and cmake/FindFFmpeg.cmake references BSD terms). Shipping an MIT-only statement can misstate redistribution obligations and break downstream license-compliance checks, so this line should be revised to enumerate or reference all applicable third-party licenses.

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[OneNoted]

Reworded the vendor licensing note to stop claiming vendor/whisper-rs-sys is MIT-only. NOTICE now points to the vendor LICENSE, whisper.cpp/LICENSE, the Apache-2.0 WITH LLVM-exception headers under whisper.cpp/ggml/include and whisper.cpp/ggml/src/ggml-sycl, and the BSD notice in whisper.cpp/cmake/FindFFmpeg.cmake. I also updated the README to match.