fix: 插件加载失败计入统计 — LOAD_FAILURES + 合并fail_details

services/plugin_service.py

@@ -17,6 +17,9 @@ from sdk.plugin_command_decorator import plugin_command, command
 
 logger = logging.getLogger(__name__)
 
+# 加载失败记录 — 供统计 API 使用
+LOAD_FAILURES: Dict[str, str] = {}
+
 @dataclass
 class PluginInfo:
     """插件信息数据类"""
@@ -309,6 +312,7 @@ class PluginService:
             plugin_path = self.plugins_dir / plugin_name
             
             if not plugin_path.exists():
+                LOAD_FAILURES[plugin_name] = "插件目录不存在"
                 logger.error(f"插件目录不存在: {plugin_path}")
                 return False