Add minimal compose for initial database setup

docker-compose.minimal.yml

@@ -0,0 +1,37 @@
+services:
+  postgres:
+    image: pgvector/pgvector:pg16
+    container_name: second-brain-postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: second_brain
+      POSTGRES_USER: brain
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-braindb2026}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "5433:5432"
+    networks:
+      - brain-net
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U brain -d second_brain"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  redis:
+    image: redis:7-alpine
+    container_name: second-brain-redis
+    restart: unless-stopped
+    volumes:
+      - redis_data:/data
+    networks:
+      - brain-net
+
+volumes:
+  postgres_data:
+  redis_data:
+
+networks:
+  brain-net:
+    driver: bridge