feat: 添加并发爬虫数量控制参数

- 新增 --max_concurrency 命令行参数
- 用于控制并发爬虫数量
- 默认值为 1

cmd_arg/arg.py

@@ -258,6 +258,14 @@ async def parse_cmd(argv: Optional[Sequence[str]] = None):
                 rich_help_panel="Comment Configuration",
             ),
         ] = config.CRAWLER_MAX_COMMENTS_COUNT_SINGLENOTES,
+        max_concurrency: Annotated[
+            int,
+            typer.Option(
+                "--max_concurrency",
+                help="Maximum number of concurrent crawlers",
+                rich_help_panel="Performance Configuration",
+            ),
+        ] = config.MAX_CONCURRENCY_NUM,
     ) -> SimpleNamespace:
         """MediaCrawler 命令行入口"""
 
@@ -283,6 +291,7 @@ async def parse_cmd(argv: Optional[Sequence[str]] = None):
         config.SAVE_DATA_OPTION = save_data_option.value
         config.COOKIES = cookies
         config.CRAWLER_MAX_COMMENTS_COUNT_SINGLENOTES = max_comments_count_singlenotes
+        config.MAX_CONCURRENCY_NUM = max_concurrency
 
         # Set platform-specific ID lists for detail/creator mode
         if specified_id_list: