Make Docker Compose Coolify-ready

COOLIFY.md

@@ -23,6 +23,13 @@ POSTGRES_USER=postgres
 POSTGRES_PASSWORD=your_password
 POSTGRES_DB=fiscal
 PORT=3001
+BETTER_AUTH_SECRET=your-random-long-secret
+BETTER_AUTH_BASE_URL=https://api.your-fiscal-domain.com
+JWT_SECRET=your-jwt-secret-key-min-32-characters
+GITHUB_ID=your-github-oauth-client-id
+GITHUB_SECRET=your-github-oauth-client-secret
+GOOGLE_ID=your-google-oauth-client-id
+GOOGLE_SECRET=your-google-oauth-client-secret
 NEXT_PUBLIC_API_URL=https://your-fiscal-domain.com
 ```
 
@@ -63,10 +70,15 @@ NEXT_PUBLIC_API_URL=https://your-fiscal-domain.com
 - `DATABASE_URL` - PostgreSQL connection string
 - `PORT` - Server port (default: 3001)
 - `NODE_ENV` - Environment (development/production)
+- `BETTER_AUTH_SECRET` - Required in production; use a long random secret
+- `BETTER_AUTH_BASE_URL` - Public backend URL used for auth callbacks
 
 ### Frontend
 - `NEXT_PUBLIC_API_URL` - Backend API URL
 
+`NEXT_PUBLIC_API_URL` is used at image build time in the frontend Docker build.
+Set it in Coolify before deploying so the generated client bundle points to the correct backend URL.
+
 ## Database Setup
 
 The application will automatically create the database schema on startup. To manually run migrations: