feat: 支持工作流插件复用与试运行

- 新增工作流插件类型、发布快照同步、实时可用性与下线影响检查

- 收口绑定候选、分类权限、间接环路校验与运行态优雅降级

- 补齐管理端工作流插件配置、详情与试运行界面及定向测试

easyflow-ui-admin/app/src/views/ai/shared/offline-impact.ts

@@ -8,8 +8,10 @@ export interface OfflineImpactBinding {
 export interface OfflineImpactCheck {
   canProceed: boolean;
   hasBotBindings: boolean;
+  hasPluginBindings: boolean;
   hasWorkflowUsages: boolean;
   botBindings: OfflineImpactBinding[];
+  pluginBindings: OfflineImpactBinding[];
   workflowUsages: OfflineImpactBinding[];
   message?: string;
 }