Bootstrap monorepo: Bun + Hono backend, Next.js frontend, Doppler secrets

[sortakool]

Closes #26

Summary

Scaffolds the full monorepo with two workspaces (apps/api and apps/web), wired to Doppler for secrets management.

Monorepo structure

• Root package.json with workspaces: ["apps/*"] and concurrent dev script
• Shared tsconfig.base.json with TypeScript strict mode
• .gitignore covering node_modules, .env*, dist/, .next/, *.db

Backend (apps/api)

• Bun + Hono app with GET /health returning { status: "ok" }
• Project structure: src/index.ts, src/routes/, src/services/, src/db/, src/lib/
• bun run dev starts with --hot reload on port 4000
• CORS configured to allow frontend origin (http://localhost:3000)

Frontend (apps/web)

• Next.js App Router with Tailwind CSS (v4 + @tailwindcss/postcss)
• React Query provider wired up in root layout
• Sidebar nav with links: Dashboard, Tours, Riders, Settings
• Placeholder pages for each nav item
• API client utility reading NEXT_PUBLIC_API_URL from env

Doppler integration

• doppler.yaml pointing to virtual-agent project / dev config
• .env.example documenting all 7 expected env vars
• README documents doppler run -- bun run dev workflow
• Backend reads secrets via process.env (Doppler injects at runtime)

Dev experience

• Root bun run dev starts both apps concurrently
• Comprehensive README with prerequisites, Doppler setup, and local dev instructions

Tests

• 58 tests across 4 files — all passing
  • Monorepo structure verification (53 tests)
  • Health endpoint tests
  • CORS middleware tests
  • App module export tests
• Gherkin feature specs in specs/features/bootstrap-monorepo.feature