docs: add Coolify deployment instructions to README

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -122,6 +122,42 @@ npx prisma studio
 
 ---
 
+## Deploy with Coolify (Docker)
+
+### 1. Add the Gitea repo in Coolify
+- New Resource → Application → Docker Compose (or Dockerfile)
+- Repository: `https://gitea.onyva.dev/TimoUttenweiler/lead-scraper`
+- Branch: `main`
+- Build method: **Dockerfile** (recommended) or **Docker Compose**
+
+### 2. Set environment variables in Coolify
+In the app's Environment Variables tab:
+
+| Variable | Value |
+|---|---|
+| `APP_ENCRYPTION_SECRET` | Any random 32-character string (generate once, keep secret) |
+| `DATABASE_URL` | `file:/data/leadflow.db` |
+| `NODE_ENV` | `production` |
+| `PORT` | `3000` |
+
+### 3. Add a persistent volume
+- Mount path in container: `/data`
+- This stores the SQLite database across deployments
+
+### 4. Port mapping
+- Container port: `3000`
+- Coolify will proxy via its reverse proxy automatically
+
+### 5. Deploy
+Click Deploy — Coolify builds the image from the Dockerfile, migrations run automatically on startup via `docker-entrypoint.sh`.
+
+### Dockerfile stages
+1. **deps** — `npm ci` + native build tools for better-sqlite3
+2. **builder** — Prisma generate + `next build` (standalone output)
+3. **runner** — minimal Alpine image, non-root user, copies only what's needed
+
+---
+
 ## Troubleshooting
 
 | Issue | Solution |