feat: 新增统一文件模块，统一文件操作

server/internal/file/infrastructure/persistence/file.go

@@ -0,0 +1,15 @@
+package persistence
+
+import (
+	"mayfly-go/internal/file/domain/entity"
+	"mayfly-go/internal/file/domain/repository"
+	"mayfly-go/pkg/base"
+)
+
+type fileRepoImpl struct {
+	base.RepoImpl[*entity.File]
+}
+
+func newFileRepo() repository.File {
+	return &fileRepoImpl{base.RepoImpl[*entity.File]{M: new(entity.File)}}
+}