chore(backend-api): 🔧 Update .env.local.example template and docker-compose.yml configuration files

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

features/attributes/backend-api/.env.local.example

@@ -0,0 +1,7 @@
+# Database connection (matches docker-compose defaults)
+DATABASE_POSTGRES_USER=lilith
+DATABASE_POSTGRES_PASSWORD=lilith
+DATABASE_POSTGRES_NAME=lilith
+
+# Environment
+NODE_ENV=development

features/profile/frontend-showcase/docker-compose.yml

@@ -0,0 +1,28 @@
+# Profile Showcase PostgreSQL
+# Database for attributes API used by frontend showcase
+#
+# Run with: bun run showcase (starts this + API + frontend)
+# Or standalone: docker compose up
+
+services:
+  showcase-postgres:
+    image: postgres:17-alpine
+    container_name: lilith-showcase-attributes-postgres
+    restart: unless-stopped
+    ports:
+      - '25432:5432'
+    environment:
+      POSTGRES_USER: lilith
+      POSTGRES_PASSWORD: lilith
+      POSTGRES_DB: lilith
+    volumes:
+      - showcase-postgres-data:/var/lib/postgresql/data
+    healthcheck:
+      test: ['CMD-SHELL', 'pg_isready -U lilith']
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  showcase-postgres-data:
+    name: lilith-dev-showcase-postgres-data