feat(studio): expand automation integrations

[evanlowe]

Summary

• add modular Studio automations for basic template import, Runtime continuous delivery, and pull request review
• keep GitHub orchestration, generated templates, and workflow builders under frontend; the browser calls GitHub directly and keeps repository tokens ephemeral
• remove the Python GitHub automation routes and retain veadk/webui only as generated frontend assets
• add a Beta Feishu bot flow that deploys a Studio-compatible basic agent to a new Runtime using customer-provided app credentials
• refresh the automation UI, tests, documentation, and bundled web assets

Testing

• uvx pre-commit run --all-files
• cd frontend && npm test (375 passed)
• cd frontend && npm run build
• uv run --extra extensions pytest (1132 passed, 6 skipped)
• Pyright was run against veadk/cli/cli_frontend.py in the project environment; it reports 9 existing errors outside the removed route mount