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)

tsconfig.json

@@ -13,10 +13,18 @@
     "baseUrl": ".",
     "paths": {
       "@shared/*": ["src/shared/*"],
-      "@renderer/*": ["src/renderer/src/*"]
+      "@renderer/*": ["src/renderer/src/*"],
+      "@rpa/core": ["packages/rpa-core/src/index.ts"],
+      "@rpa/core/capabilities": ["packages/rpa-core/src/capabilities/index.ts"]
     },
     "types": ["node"]
   },
-  "include": ["src/**/*.ts", "src/**/*.tsx", "electron.vite.config.ts", "scripts/**/*.mjs"],
+  "include": [
+    "src/**/*.ts",
+    "src/**/*.tsx",
+    "packages/rpa-core/src/**/*.ts",
+    "electron.vite.config.ts",
+    "scripts/**/*.mjs"
+  ],
   "exclude": ["node_modules", "out", "release"]
 }