全局重命名：kefu_sys / kefu-sys 改为 kefu_cloud / kefu-cloud

- Go module 与全部 import 路径
- 数据库默认库名、Docker 服务/卷命名与部署文档

docker-compose.dev.yml

@@ -1,11 +1,11 @@
 services:
   postgres:
     image: postgres:16-alpine
-    container_name: kefu-db
+    container_name: kefu-cloud-db
     environment:
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: postgres
-      POSTGRES_DB: kefu_sys
+      POSTGRES_DB: kefu_cloud
     ports:
       - "5433:5432"
     volumes:
@@ -13,7 +13,7 @@ services:
 
   minio:
     image: minio/minio:latest
-    container_name: kefu-minio
+    container_name: kefu-cloud-minio
     command: server /data --console-address ":9001"
     environment:
       MINIO_ROOT_USER: minioadmin
@@ -29,7 +29,7 @@ services:
   # 注意：容器网络内仍访问 minio:9000（服务端口），宿主机映射为 9100
   minio-init:
     image: minio/mc:latest
-    container_name: kefu-minio-init
+    container_name: kefu-cloud-minio-init
     depends_on:
       - minio
     restart: "no"