v1.0.0

• Switched the project to a uv-native workflow with uv_build, dependency groups, and a refreshed lockfile.
• Modernized pyproject.toml metadata and tool configuration for the current package layout.
• Refactored the CLI implementation with stronger typing, centralized constants, and a canonical alphafold_file_url helper while keeping backward compatibility for the older misspelled helper name.
• Added explicit typing exports in affetch.__init__ and affetch.__version__.
• Replaced the placeholder test module with executable smoke tests for core parsing and file-writing behavior.
• Rewrote the README, contributing guide, and MkDocs site to focus on real install, usage, development, and reference workflows.