Add project lifecycle overview docs

[Wuxz-123]

Summary

• add a project lifecycle overview page that maps create, configure, run, extend, build, deploy, and operate stages
• add the page to MkDocs navigation and the Docs overview
• include matching Chinese documentation for the i18n site

Closes #93

Verification

• uv run mkdocs build -s
• make docs-test
• git diff --check

[webup]

Thanks for the documentation update. This currently has a structural issue that prevents merge:

• docs/guides/project-lifecycle.md was removed and docs/zh/guides/project-lifecycle.md now contains the English version, so the English page referenced by mkdocs.yml no longer exists while the Chinese site has no translated counterpart. This breaks the English docs build/navigation.

Please restore the English page at docs/guides/project-lifecycle.md, add the Chinese translation under docs/zh/guides/project-lifecycle.md, and rerun the docs build/tests before reopening.