feat: export Rsbuild APIs from rstack/app

[chenjiahan]

This PR adds a rstack/app entry point so Rstack CLI users can access Rsbuild APIs without declaring @rsbuild/core as a direct dependency.

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between ce35db9 and 2e3f36b.

📒 Files selected for processing (7)

• .agents/skills/rstack-cli-best-practices/SKILL.md
• README.md
• packages/rstack/package.json
• packages/rstack/rslib.config.ts
• packages/rstack/src/app.ts
• packages/rstack/test/exports/app-subpath/index.test.ts
• packages/rstack/test/tsconfig.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/feat-rstack-app-export

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