refactor(workflow): 统一 OSS 接口并重构恢复锁

- 将文件地址前缀与上传逻辑迁移至 common/oss
- 恢复执行改用 utils.WithLock 自动续期锁
- 转写提示词增加单镜头最小时长约束

workflow/service/flow/lambda_node.go

@@ -23,7 +23,7 @@ import (
 	"sync"
 
 	"gitea.redpowerfuture.com/red-future/common/db/gfdb"
-	"gitea.redpowerfuture.com/red-future/common/utils"
+	"gitea.redpowerfuture.com/red-future/common/oss"
 	"github.com/cloudwego/eino-examples/compose/batch/batch"
 	"github.com/cloudwego/eino/compose"
 	"github.com/gogf/gf/v2/database/gdb"
@@ -670,7 +670,7 @@ func resolveFileContent(val any) (isPath bool, path string, fileBytes []byte, ex
 		return true, s, nil, ""
 	}
 	// MinIO 对象裸路径（无 http 前缀，模型网关转存 OSS 后返回）
-	if utils.IsOSSPath(s) {
+	if oss.IsOSSPath(s) {
 		return true, s, nil, ""
 	}
 	// data URI：data:<mime>;base64,<payload>