chore: migrate Rspress to Rstack CLI

[chenjiahan]

Summary

This PR migrates the Rsbuild website from standalone Rspress commands and configuration to Rstack CLI, keeping the existing documentation behavior while using the unified rs doc workflow. It also routes website Rsbuild types through Rstack and removes the direct @rsbuild/core dependency.

[coderabbitai]

📝 Walkthrough

Walkthrough

The website documentation tooling was migrated from Rspress to RStack. Scripts now use rs doc, configuration uses define.doc, and rstack was added as a development dependency. TypeScript settings now include the RStack configuration and allow TypeScript extensions without emitting files. Theme ambient and plugin type references were updated to RStack packages.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the main change: migrating Rspress to the Rstack CLI.
Description check	✅ Passed	The description accurately summarizes the migration to Rstack CLI and related type/dependency updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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[cloudflare-workers-and-pages]

Deploying rsbuild with    Cloudflare Pages

Latest commit:	81cb622
Status:	✅  Deploy successful!
Preview URL:	https://7ff42a24.rsbuild-v2.pages.dev
Branch Preview URL:	https://chenjiahan-chore-rspress-rst.rsbuild-v2.pages.dev

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@website/rstack.config.ts`:
- Line 20: Update the documentation configuration around define.doc in the
RStack config to export its returned configuration as the module default.
Preserve the existing configuration object and verify the resulting export
matches the installed RStack API.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d7b49534-22f6-42d4-b741-5ca0afa9cfcc

📥 Commits

Reviewing files that changed from the base of the PR and between 3e62fc9 and 81cb622.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (5)

• website/package.json
• website/rstack.config.ts
• website/theme/env.d.ts
• website/theme/rsbuildPluginOverview.ts
• website/tsconfig.json