perf: plugin runtime connection robustness (#1698)

* debug: print detailed make connection failure error

* perf: active heartbeat to plugin runtime

* feat: add `--debug` arg

main.py

@@ -18,7 +18,13 @@ asciiart = r"""
 
 async def main_entry(loop: asyncio.AbstractEventLoop):
     parser = argparse.ArgumentParser(description='LangBot')
-    parser.add_argument('--standalone-runtime', action='store_true', help='使用独立插件运行时', default=False)
+    parser.add_argument(
+        '--standalone-runtime',
+        action='store_true',
+        help='Use standalone plugin runtime / 使用独立插件运行时',
+        default=False,
+    )
+    parser.add_argument('--debug', action='store_true', help='Debug mode / 调试模式', default=False)
     args = parser.parse_args()
 
     if args.standalone_runtime:
@@ -26,6 +32,11 @@ async def main_entry(loop: asyncio.AbstractEventLoop):
 
         platform.standalone_runtime = True
 
+    if args.debug:
+        from pkg.utils import constants
+
+        constants.debug_mode = True
+
     print(asciiart)
 
     import sys