chore: remove IndexTTS Python codebase

Merge pull request #1 from 8b-is/claude/convert-to-rust-01USgPYEqMyp5KXjjFNVwztU

Update src/model/embedding.rs

Update src/text/phoneme.rs

Update src/text/phoneme.rs

Add codebase analysis documentation and update gitignore

Convert IndexTTS to pure Rust implementation

Delete INDEX_MODEL_LICENSE_ZH.txt

Delete INDEX_MODEL_LICENSE_EN.txt

init