feat: 实现数据库配置和模板迁移系统

- 配置MySQL数据库连接和TypeORM集成
- 创建N8nTemplate实体和动态实例实体
- 实现混合架构：代码逻辑+数据库配置
- 添加模板工厂服务和迁移服务
- 创建RESTful API控制器用于模板管理
- 将所有n8nTemplates模板整理为独立migration文件
- 添加完整的数据库迁移指南和使用文档
- 更新app.module.ts集成新服务和配置

package.json

@@ -18,15 +18,26 @@
     "test:watch": "jest --watch",
     "test:cov": "jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
-    "test:e2e": "jest --config ./test/jest-e2e.json"
+    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "typecheck": "tsc --noEmit",
+    "typeorm": "typeorm-ts-node-commonjs",
+    "migration:generate": "npm run typeorm -- migration:generate",
+    "migration:run": "npm run typeorm -- migration:run",
+    "migration:revert": "npm run typeorm -- migration:revert",
+    "schema:sync": "npm run typeorm -- schema:sync",
+    "schema:drop": "npm run typeorm -- schema:drop"
   },
   "dependencies": {
     "@nestjs/common": "^11.0.1",
+    "@nestjs/config": "^4.0.2",
     "@nestjs/core": "^11.0.1",
     "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/typeorm": "^11.0.0",
     "axios": "^1.11.0",
+    "mysql2": "^3.9.7",
     "reflect-metadata": "^0.2.2",
-    "rxjs": "^7.8.1"
+    "rxjs": "^7.8.1",
+    "typeorm": "^0.3.20"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.2.0",