chore(release): release v2.0.0

[Irishsmurf]

Releases v2.0.0 of dlight-client.

Key Changes:

• Automatic Reconnection: Transparent retry on stale connections in ConnectionPool.
• Streaming Discovery: Incremental device discovery with discover_devices_stream().
• Type Safety: PEP 561 compliance with py.typed and resolved all strict type-checking issues.
• Improved API Features: Added LightScene support, DLightDevice.apply_scene(), .ping(), .toggle(), and state-change listeners.
• CI/CD & Linting: Moved to Ruff, added automated code coverage with 80% threshold enforcement, and pre-commit configuration.
• Documentation: Fully-featured MkDocs documentation site with automated GitHub Pages deployment.

[gemini-code-assist]

Code Review

This pull request bumps the project version from 1.6.1 to 2.0.0, updating the version identifier in dlightclient/__init__.py and adding the corresponding release notes and links in CHANGELOG.md. There are no review comments, and I have no feedback to provide.

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