Initialize microsite monorepo foundation

[jk-kim0]

Summary

• Initialize corp-web-micro as an npm-workspaces monorepo for small independent QueryPie micro websites.
• Add the first Next.js app, apps/finance, using Next.js 16, React 19, TypeScript, and Tailwind CSS v4.
• Recreate the initial Finance AIP landing page from the provided Vercel reference as Japanese website content.
• Add shared starter packages for micro-site UI primitives and canonical links back to the main QueryPie AI Japan website.
• Add English repository guidance plus repo-local agent skills adapted for micro-site authoring/setup.
• Add baseline CI and lightweight structure tests.

Verification

• npm run test:ci

Notes

• The finance app currently uses https://finance.querypie.ai as the placeholder canonical production URL in apps/finance/src/lib/site-config.ts; update it when the final domain is chosen.
• npm audit --audit-level=moderate reports the current PostCSS advisory through next@16.2.6. npm suggests downgrading to next@9.3.3 as the available forced fix, so this PR keeps the latest stable Next.js 16 setup instead of applying that downgrade.