Bootstrap Hooky monorepo

[dakdevs]

What changed

• bootstraps Hooky as a Bun workspace with a Next.js 16 web application
• adds a tested health endpoint and a responsive bootstrap product surface
• adds Playwright E2E coverage with deterministic web-server ownership
• configures ESLint, Prettier, strict TypeScript, Turborepo, and GitHub Actions
• documents local development and repository-specific agent rules

Why

This establishes Milestone 0 from the Hooky PRD and proves the repository can build, test, and serve a minimal vertical slice before database and relay work begins.

Refs #1

Validation

• bun run lint
• bun run prettier:check
• bun run typecheck
• bun test
• bun run test:e2e
• bun run build
• E2E was run twice consecutively to verify the Next.js test server tears down cleanly
• desktop and mobile renders were visually inspected

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