修复：算法绑定部分更新时保留未发送字段的旧值

前端可能只发送 params 等部分字段，未发送的字段保留数据库原值。

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main/java/com/genersoft/iot/vmp/aiot/service/impl/AiRoiServiceImpl.java

@@ -261,6 +261,12 @@ public class AiRoiServiceImpl implements IAiRoiService {
         if (old == null) {
             throw new IllegalArgumentException("绑定关系不存在");
         }
+        // 部分更新：前端可能只发送部分字段，未发送的字段保留旧值
+        if (bind.getParams() == null) bind.setParams(old.getParams());
+        if (bind.getPriority() == null) bind.setPriority(old.getPriority());
+        if (bind.getEnabled() == null) bind.setEnabled(old.getEnabled());
+        if (bind.getTemplateId() == null) bind.setTemplateId(old.getTemplateId());
+        if (bind.getParamOverride() == null) bind.setParamOverride(old.getParamOverride());
         bind.setUpdateTime(now);
         bindMapper.updateByBindId(bind);
         configLogService.addLog("BIND", bind.getBindId(), toJson(old), toJson(bind), null);