fix(ai-search): 修复经纬度参数传递错误

- 修正了经度参数字段名从 lan 到 lon 的映射
- 确保 AI 搜索请求中正确的经纬度数据传递
- 解决了因参数错误导致的位置搜索功能问题

alien-store/src/main/java/shop/alien/store/controller/AiSearchController.java

@@ -44,7 +44,7 @@ public class AiSearchController {
         requestBody.put("query", map.get("storeName"));
         requestBody.put("limit", map.get("pageSize"));
         requestBody.put("user_lat", map.get("lat"));
-        requestBody.put("user_lng", map.get("lan"));
+        requestBody.put("user_lng", map.get("lon"));
         requestBody.put("category", map.get("category"));
         HttpHeaders aiHeaders = new HttpHeaders();
         aiHeaders.setContentType(MediaType.APPLICATION_JSON);