Checkpoint: Initial stable CheckFlow base before i18n and demo mode

.env.example

@@ -0,0 +1,11 @@
+# Database password (change in production!)
+POSTGRES_PASSWORD=changeme
+
+# App URL (set to your domain or server IP)
+NEXTAUTH_URL=http://localhost:3000
+
+# Auth secret — generate with: openssl rand -base64 32
+NEXTAUTH_SECRET=change-this-to-a-random-string
+
+# Port to expose (default 3000)
+PORT=3000