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)

packages/rpa-core/package.json

@@ -0,0 +1,40 @@
+{
+  "name": "@rpa/core",
+  "version": "0.1.0",
+  "private": true,
+  "description": "RPA 能力层：零 Electron 依赖的流程引擎、能力注册表与纯 Node 能力",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts",
+    "./capabilities": "./src/capabilities/index.ts"
+  },
+  "scripts": {
+    "test": "vitest run",
+    "typecheck": "tsc --noEmit -p tsconfig.json"
+  },
+  "dependencies": {
+    "@gutenye/ocr-node": "^1.4.9",
+    "adm-zip": "^0.5.16",
+    "basic-ftp": "^6.2.3",
+    "exceljs": "^4.4.0",
+    "imapflow": "^2.10.0",
+    "mailparser": "^3.14.1",
+    "mssql": "^12.7.13",
+    "mysql2": "^3.24.6",
+    "nodemailer": "^6.9.16",
+    "pdf-lib": "^1.17.1",
+    "pg": "^8.23.1",
+    "pngjs": "^7.0.0",
+    "sm-crypto": "^0.5.8"
+  },
+  "devDependencies": {
+    "@types/adm-zip": "^0.5.7",
+    "@types/mssql": "^12.3.0",
+    "@types/nodemailer": "^6.4.17",
+    "@types/pg": "^8.23.1",
+    "@types/pngjs": "^6.0.5",
+    "typescript": "^5.7.2",
+    "vitest": "^2.1.8"
+  }
+}