feat: 在QrProxyController中添加自定义扫码内容的设置，更新GameInterfaceResponse以支持该内容，增强用户体验

src/main/java/com/gameplatform/server/controller/link/QrProxyController.java

@@ -274,6 +274,8 @@ public class QrProxyController {
             response.setEndRewardUrl(appBaseUrl + "/api/link/image/" + codeNo + "/end-reward.png");
             // 设置用户进度显示格式（从系统配置读取）
             response.setProgressDisplayFormat(systemConfigService.getProgressDisplayFormat());
+            // 设置自定义扫码内容（从系统配置读取）
+            response.setCustomScanContent(systemConfigService.getCustomScanContent());
             
             log.info("游戏界面数据构建完成: codeNo={}, totalPoints={}", codeNo, response.getTotalPoints());
             

src/main/java/com/gameplatform/server/model/dto/link/GameInterfaceResponse.java

@@ -50,6 +50,9 @@ public class GameInterfaceResponse {
     @Schema(description = "用户端进度显示格式：percent 或 ratio", example = "percent")
     private String progressDisplayFormat;
     
+    @Schema(description = "自定义扫码界面内容")
+    private String customScanContent;
+
     public String getProgressDisplayFormat() {
         return progressDisplayFormat;
     }
@@ -58,6 +61,14 @@ public class GameInterfaceResponse {
         this.progressDisplayFormat = progressDisplayFormat;
     }
     
+    public String getCustomScanContent() {
+        return customScanContent;
+    }
+    
+    public void setCustomScanContent(String customScanContent) {
+        this.customScanContent = customScanContent;
+    }
+
     public String getCodeNo() {
         return codeNo;
     }

src/main/java/com/gameplatform/server/service/admin/SystemConfigService.java

@@ -123,6 +123,11 @@ public class SystemConfigService {
         return getConfigValue("user.progress_display_format", "percent");
     }
     
+    // 获取用户端自定义扫码内容
+    public String getCustomScanContent() {
+        return getConfigValue("user.custom_scan_content", "");
+    }
+    
     // 批量更新配置
     public boolean updateConfigs(List<SystemConfig> configs) {
         if (configs == null || configs.isEmpty()) {