chore: add pre-commit configuration and CI

[nearlyforget]

Description:
This PR establishes a robust linting and formatting pipeline for the Python SDK. By integrating pre-commit, we
automate the enforcement of code quality standards and security best practices.

Tools & Hooks Added:

• Ruff: Highly efficient Python linter and formatter. Configured to automatically fix safe issues and ensure
  consistent code style across the SDK's extensive model and schema definitions.
• Prettier: Handles formatting for non-Python assets, including Markdown documentation, YAML workflows, and JSON
  files.
• ShellCheck: Ensures the reliability and portability of generate_models.sh.
• codespell: Periodically checks the codebase for common typos in docstrings and comments.
• Hygiene Hooks: Standardizes file endings and removes trailing whitespace to keep the diffs clean.

CI/CD Integration:

• GitHub Actions (linter.yml): Automatically validates every push and pull request against these standards to
  prevent the introduction of unformatted code.