Add Coolify compose and env example

.env.coolify.example

@@ -0,0 +1,12 @@
+# Coolify environment variables (example values)
+POSTGRES_USER=gob
+POSTGRES_PASSWORD=change-me-strong
+POSTGRES_DB=gob_alert
+
+# Internal Docker network connection
+DATABASE_URL=postgres://gob:change-me-strong@postgres:5432/gob_alert
+
+API_ADMIN_KEY=change-me-strong
+
+# Web -> API internal URL (API is NOT public)
+API_URL=http://api:3000