docs: Add setup guide with Supabase credentials

SETUP.md

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+# Pantry - Setup Guide
+
+## ✅ Current Status
+
+### Infrastructure (Complete)
+
+- **Supabase Dev Instance**: Running on Coolify
+  - URL: `https://supabasekong-ewo8wssk4gs8cgg0c8kosk40.jeanlucmakiola.de`
+  - Status: ✅ Healthy
+  - Services: PostgreSQL, Auth (GoTrue), Realtime, Storage, PostgREST
+  
+### Environment Configuration (Complete)
+
+- `.env.example` - Template for all environments
+- `.env.development` - Dev credentials (Coolify Supabase)
+- `.gitignore` - Protects secrets
+
+---
+
+## 🚀 Quick Start (Development)
+
+### Prerequisites
+
+- **Bun** 1.0+ (or Node.js 20+)
+- **Git** access to repository
+- **Access to Coolify** Supabase instance (credentials in `.env.development`)
+
+### Setup Steps
+
+1. **Clone Repository**
+   ```bash
+   git clone https://gitea.jeanlucmakiola.de/pantry-app/pantry.git
+   cd pantry
+   ```
+
+2. **Copy Development Environment**
+   ```bash
+   cp .env.development .env
+   ```
+
+3. **Install Dependencies** (once `app/` exists)
+   ```bash
+   cd app
+   bun install
+   ```
+
+4. **Apply Database Migrations** (once created)
+   ```bash
+   cd supabase
+   # TBD: Migration command
+   ```
+
+5. **Start Development Server**
+   ```bash
+   cd app
+   bun run dev
+   ```
+
+6. **Access App**
+   - App: `http://localhost:3000`
+   - Supabase API: `https://supabasekong-ewo8wssk4gs8cgg0c8kosk40.jeanlucmakiola.de`
+
+---
+
+## 🗄️ Supabase Instance Details
+
+### Endpoints
+
+| Service | URL |
+|---------|-----|
+| API (PostgREST) | `https://supabasekong-ewo8wssk4gs8cgg0c8kosk40.jeanlucmakiola.de/rest/v1/` |
+| Auth | `https://supabasekong-ewo8wssk4gs8cgg0c8kosk40.jeanlucmakiola.de/auth/v1/` |
+| Realtime | `wss://supabasekong-ewo8wssk4gs8cgg0c8kosk40.jeanlucmakiola.de/realtime/v1/` |
+| Storage | `https://supabasekong-ewo8wssk4gs8cgg0c8kosk40.jeanlucmakiola.de/storage/v1/` |
+
+### Credentials
+
+**Public (safe to use in frontend):**
+- Anon Key: In `.env.development`
+
+**Secret (server-side only):**
+- Service Role Key: In `.env.development`
+- JWT Secret: In `.env.development`
+- Postgres Password: In `.env.development`
+
+### Dashboard Access
+
+If Supabase Studio is exposed on Coolify:
+- URL: Check Coolify service configuration
+- Username: From `SERVICE_USER_ADMIN` in Coolify
+- Password: From `SERVICE_PASSWORD_ADMIN` in Coolify
+
+---
+
+## 📋 Next Steps
+
+### Week 1: Foundation (In Progress)
+
+- [x] ~~Supabase dev environment setup~~ (Complete)
+- [x] ~~Environment configuration~~ (Complete)
+- [ ] Create database schema (`supabase/migrations/`)
+- [ ] Scaffold Nuxt 4 app (`app/`)
+- [ ] Implement email/password auth
+- [ ] Deploy first version to Coolify
+
+### Immediate Tasks
+
+1. **Database Schema** (#10)
+   - Create migration files in `supabase/migrations/`
+   - Tables: `inventory_items`, `products`, `tags`, `item_tags`, `units`
+   - See: `docs/DATABASE.md`
+
+2. **Nuxt Scaffold** (#8)
+   - Initialize Nuxt 4 project in `app/`
+   - Install dependencies: `@nuxtjs/supabase`, `@nuxt/ui`, Tailwind
+   - Configure `nuxt.config.ts`
+
+3. **Auth Implementation** (#11)
+   - Supabase Auth integration
+   - Login/signup pages
+   - Protected routes
+
+---
+
+## 🔧 Development Workflow
+
+### Making Changes
+
+```bash
+# 1. Create feature branch
+git checkout -b feature/your-feature
+
+# 2. Make changes
+# Edit files...
+
+# 3. Test locally
+bun run dev
+
+# 4. Commit and push
+git add .
+git commit -m "feat: Your feature description"
+git push origin feature/your-feature
+
+# 5. Create PR on Gitea
+```
+
+### Database Migrations
+
+```bash
+# Create new migration
+cd supabase/migrations
+touch 001_initial_schema.sql
+
+# Edit migration file (SQL)
+# Test locally against Coolify Supabase instance
+
+# Apply migration (TBD - once we set up migration tooling)
+```
+
+---
+
+## 🚨 Troubleshooting
+
+### Can't connect to Supabase
+
+**Test connection:**
+```bash
+curl -s "https://supabasekong-ewo8wssk4gs8cgg0c8kosk40.jeanlucmakiola.de/rest/v1/" \
+  -H "apikey: <ANON_KEY>"
+```
+
+Should return OpenAPI spec. If not:
+- Check Coolify service status
+- Verify URL in `.env`
+- Check network/firewall
+
+### Environment variables not loading
+
+- Ensure `.env` exists in project root
+- Check `.env` has no syntax errors
+- Restart dev server after changes
+
+### Database migration issues
+
+- Verify `SUPABASE_SERVICE_ROLE_KEY` is set
+- Check migration SQL syntax
+- Review Supabase logs in Coolify
+
+---
+
+## 📚 Documentation
+
+- [Project Plan](docs/PROJECT_PLAN.md) - Vision, roadmap
+- [Architecture](docs/ARCHITECTURE.md) - Tech stack, design
+- [Database Schema](docs/DATABASE.md) - Tables, RLS, functions
+- [API Reference](docs/API.md) - Endpoints, usage
+- [Development Guide](docs/DEVELOPMENT.md) - Conventions, workflow
+- [Deployment](docs/DEPLOYMENT.md) - Docker, Coolify
+
+---
+
+**Last Updated:** 2026-02-08  
+**Status:** Week 1 - Foundation in progress