Migrate documentation site to Rspress

[ruibaby]

What changed

• Replace the Docusaurus documentation site with Rspress.
• Reorganize user and developer documentation with Rspress navigation metadata.
• Add a task-oriented documentation homepage, shared theme overrides, and responsive styles.
• Preserve legacy documentation URLs with EdgeOne redirects and link archived versions from the new navigation.
• Update CI, Node.js, pnpm, Biome, and Rspress-related dependencies.
• Add repository agent guidance and bundled Rspress skills.

Validation

• pnpm check:ci
• pnpm build

[chatgpt-codex-connector]

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Reviewed commit: 4bd2850885

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[chatgpt-codex-connector]

Regenerate the lockfile as one YAML document

The second --- starts another complete lockfile document, so dependency installation cannot parse this file; running pnpm install --frozen-lockfile reports ERR_PNPM_BROKEN_LOCKFILE: expected a single document in the stream, but found more. This blocks both fresh local setup and the workflow's Install dependencies step, so regenerate the lockfile rather than concatenating the package-manager bootstrap data with the project lockfile.

AGENTS.md reference: AGENTS.md:L18-L18

Useful? React with 👍 / 👎.

[chatgpt-codex-connector]

Replace the nonexistent start command

After this migration, package.json defines dev but no start script, so following the Local Development instructions fails with ERR_PNPM_NO_SCRIPT. Change this example to pnpm dev (or restore a compatible start alias) so contributors can launch the Rspress server as documented.

AGENTS.md reference: AGENTS.md:L11-L13

Useful? React with 👍 / 👎.