v0.8.0

Added

• Add integration tests with a mocked Ollama API.
• Add test job to CI.

Changed

• Refactor the public API to use a provider abstraction (breaking change).
• Use AsRef<Path> bounds for all public functions that take a Path argument.
• Enable all clippy restriction lints and fix any resulting issues.
• Reorganize unit tests into separate helpers (pure logic) and api (Ollama-dependent) submodules.
• Improve comments.
• Update documentation.
• Update dependencies.