Fix OctoPrint plugin registry review issues

[Copilot]

Addresses feedback from the OctoPrint plugin registry PR review. Several code quality and structural issues were identified that needed resolving before the plugin can be listed.

__init__.py

• Top-level import: Moved from lywsd03mmc import Lywsd03mmcClient to module level; removed the redundant per-call ImportError try/catch — the library is declared as a dependency so it's always present
• Remove AssetPlugin: Dropped from class inheritance and removed the empty get_assets() method entirely
• Fix software update key: plotlyGraphLywsd03mmc → plotly_graph_lywsd03mmc to match plugin_identifier in setup

Project packaging

• Migrate to pyproject.toml: Replaced verbose legacy setup.py with the modern OctoPrint cookiecutter format; setup.py is now a one-liner for setuptools<77 license compatibility
• Add author email: Populated the previously empty plugin_author_email field
• License consistency: Corrected AGPLv3 leftover from the cookiecutter template to MIT, matching the LICENSE file and README

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/OctoPrint/plugins.octoprint.org/issues/comments/3940399674
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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