阶段1-rpa-core建包: engine+31个纯Node能力迁入packages/rpa-core, 领域类型单一源化, createEngine工厂收拢模块级状态

- engine/(registry/types/runtime/expression)物理迁入包, 解耦shared/types(域类型归包, 宿主type-only re-export)
- 31个纯Node能力+27个测试迁入包; 宿主留守Electron/浏览器/AI依赖能力, index.ts经@rpa/core/capabilities拉起
- 新增createEngine()/defaultEngine: excel缓存/Excel句柄/db连接/FTP客户端/OCR实例/拟真设置挂引擎实例
- remaining-core子流程依赖改为host-bridge注入, 包内不再import宿主flows
- 宿主main/index.ts启动时注入子流程源; electron-vite/vitest/tsconfig配@rpa/core源码别名
- 验证: typecheck绿, 快照909个id diff为零, 332测试过(2个桌面冒烟因会话无交互SetForegroundWindow被拒, 环境阻塞)

src/main/index.ts

@@ -11,7 +11,7 @@ import {
 import "./capabilities";
 import { catalogPath, loadCatalog } from "./catalog";
 import { createDemoFlow, createExampleFlows, createFlow, deleteFlow, getFlow, listFlows, saveFlow } from "./flows";
-import { capabilityCount, capabilityIds } from "./engine/registry";
+import { capabilityCount, capabilityIds, setSubflowSource } from "@rpa/core";
 import { closeBrowserSession, setMainWindowGetter, startRun, stopRun } from "./run/manager";
 import { registerOverlayIpc } from "./overlay";
 import { fixtureUrl, startFixtureServer, stopFixtureServer } from "./fixture/server";
@@ -21,6 +21,9 @@ import { pickDesktopElement, listVisibleWindows, pickScreenRegion } from "./desk
 import { detectVisionLabTarget, listVisionLabSources } from "./vision-lab";
 import { logMain } from "./logger";
 
+// 子流程仓库在宿主（flows.ts），包内能力经 host-bridge 取用（阶段 2 正式化 HostBridge）
+setSubflowSource({ listFlows: async () => listFlows(), getFlow: async (id) => getFlow(id) });
+
 let mainWindow: BrowserWindow | null = null;
 
 if (process.env.RPA_ENABLE_GPU !== "1") app.disableHardwareAcceleration();