Consolidate web, computer, android, and ios plugins into one unified
plugin so users can install all skills with a single command:
/plugin install midscene-automation@midscene-marketplace
setup.json files were static and never dynamically updated, duplicating
information already present in each skill's SKILL.md. Remove all 4
setup.json files and update references in SKILL.md and README.md.
Streamline the setup process to match agent-browse's approach:
- Remove manual pnpm install/build steps (handled by postinstall)
- Use MIDSCENE_MODEL_* environment variables instead of .env file
- Add .env.example with official Midscene configuration format
- Update documentation to show 3-step quick install