feat: vendor-product-category matrix with infra/ib modes and docker setup

docker-compose.yml

@@ -0,0 +1,11 @@
+services:
+  zkart:
+    build: .
+    container_name: zkart-app
+    ports:
+      - "5000:5000"
+    environment:
+      SECRET_KEY: ${SECRET_KEY:-change-me-please}
+    volumes:
+      - ./matrix.db:/app/matrix.db
+    restart: unless-stopped