fix: 修复后端服务配置文件路径和Docker镜像问题

- 修复配置文件路径错误：etc/photographyapi-api.yaml -> etc/photography-api.yaml
- 修复Dockerfile未包含配置文件的问题
- 确保后端服务容器能正确加载配置文件

修复了容器启动时报'config file etc/photographyapi-api.yaml: no such file or directory'的错误

backend/cmd/api/main.go

@@ -13,7 +13,7 @@ import (
 	"github.com/zeromicro/go-zero/rest"
 )
 
-var configFile = flag.String("f", "etc/photographyapi-api.yaml", "the config file")
+var configFile = flag.String("f", "etc/photography-api.yaml", "the config file")
 
 func main() {
 	flag.Parse()