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)

electron.vite.config.ts

@@ -6,9 +6,12 @@ export default defineConfig({
   main: {
     plugins: [externalizeDepsPlugin()],
     resolve: {
-      alias: {
-        "@shared": resolve("src/shared")
-      }
+      alias: [
+        { find: "@shared", replacement: resolve("src/shared") },
+        // rpa-core 包以源码形式打进主进程产物（不作为外部依赖运行时 require）
+        { find: /^@rpa\/core$/, replacement: resolve("packages/rpa-core/src/index.ts") },
+        { find: /^@rpa\/core\/capabilities$/, replacement: resolve("packages/rpa-core/src/capabilities/index.ts") }
+      ]
     },
     build: {
       rollupOptions: {