refactor: 消息模块重构，infra包路径简写等

server/internal/flow/infra/persistence/execution.go

@@ -0,0 +1,15 @@
+package persistence
+
+import (
+	"mayfly-go/internal/flow/domain/entity"
+	"mayfly-go/internal/flow/domain/repository"
+	"mayfly-go/pkg/base"
+)
+
+type exectionImpl struct {
+	base.RepoImpl[*entity.Execution]
+}
+
+func newExectionRepo() repository.Execution {
+	return &exectionImpl{}
+}