refactor: 全局去除误导性AI描述与浮夸修饰，面向生产环境标准化商务智能术语

backend/src/modules/ai/service/deepseek.ts

@@ -204,7 +204,7 @@ export class DeepSeekService extends BaseService {
   ): string {
     const parts: string[] = [];
 
-    parts.push('你是 OmniCard AI 驱动的移动微官网数字人智能顾问。');
+    parts.push('你是微官网的在线智能商务顾问。');
     if (card?.name) parts.push(`名片所有者姓名: ${card.name}`);
     if (card?.company) parts.push(`所属企业: ${card.company}`);
     if (card?.title) parts.push(`头衔职位: ${card.title}`);