fix: 修复TypeScript配置错误并更新项目文档

详细说明:
- 修复了@n8n/config包的TypeScript配置错误
- 移除了不存在的jest-expect-message类型引用
- 清理了所有TypeScript构建缓存
- 更新了可行性分析文档，添加了技术实施方案
- 更新了Agent prompt文档
- 添加了会展策划工作流文档
- 包含了n8n-chinese-translation子项目
- 添加了exhibition-demo展示系统框架

n8n-n8n-1.109.2/packages/@n8n/nodes-langchain/credentials/SearXngApi.credentials 2.ts

@@ -0,0 +1,19 @@
+import type { ICredentialType, INodeProperties } from 'n8n-workflow';
+
+export class SearXngApi implements ICredentialType {
+	name = 'searXngApi';
+
+	displayName = 'SearXNG';
+
+	documentationUrl = 'searxng';
+
+	properties: INodeProperties[] = [
+		{
+			displayName: 'API URL',
+			name: 'apiUrl',
+			type: 'string',
+			default: '',
+			required: true,
+		},
+	];
+}