Add Next.js template

templates/nextjs-supabase.md

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+# Next.js + Supabase Template
+
+## Tech Stack
+- Framework: Next.js 15 (App Router)
+- Database: Supabase (PostgreSQL)
+- Auth: Supabase Auth
+- Styling: Tailwind CSS + shadcn/ui
+- Language: TypeScript
+
+## Project Structure
+```
+/app
+  /api          # API routes
+  /(auth)       # Auth pages
+  /(dashboard)  # Protected routes
+  layout.tsx
+  page.tsx
+/components
+  /ui           # shadcn components
+/lib
+  supabase.ts   # Supabase client
+  utils.ts
+/types
+```
+
+## Initial Setup Commands
+```bash
+npx create-next-app@latest --typescript --tailwind --eslint --app
+npx shadcn-ui@latest init
+npm install @supabase/supabase-js @supabase/ssr
+```
+
+## Environment Variables
+```
+NEXT_PUBLIC_SUPABASE_URL=
+NEXT_PUBLIC_SUPABASE_ANON_KEY=
+SUPABASE_SERVICE_ROLE_KEY=
+```