fix(plugin): close cancellable install lifecycle gaps

app/runtime/extensions/plugin/dependency.py

@@ -63,6 +63,27 @@ class PluginDependencyService:
         """安装当前环境缺失的插件依赖并保持历史列表返回合同。"""
         return self.install_missing_with_status().missing
 
+    async def async_install_missing_with_status(self) -> PluginDependencyInstallResult:
+        """在异步启动链中恢复缺失依赖，确保安装子进程可取消。"""
+        installer = self._system().dependency
+        missing = await installer.async_find_missing()
+        if not missing:
+            return PluginDependencyInstallResult(missing=[], success=True)
+        self._logger.debug(f"检测到缺失的依赖项: {missing}")
+        self._logger.info(f"开始安装缺失的依赖项，共 {len(missing)} 个...")
+        started = time.time()
+        success, _message = await installer.async_install(missing)
+        elapsed = time.time() - started
+        if success:
+            self._logger.info(
+                f"已完成 {len(missing)} 个依赖项安装，总耗时：{elapsed:.2f} 秒"
+            )
+        else:
+            self._logger.warning(
+                f"存在缺失依赖项安装失败，请尝试手动安装，总耗时：{elapsed:.2f} 秒"
+            )
+        return PluginDependencyInstallResult(missing=missing, success=success)
+
     def classify_plugins(self) -> PluginDependencyClassification:
         """返回启动编排使用的轻量插件分类。"""
         ready, missing_dependencies, missing_source = (