feat: 完善智能体图片聊天与会话恢复

- 增加私有图片上传、绑定、历史回显与生命周期清理

- 支持输入草稿恢复、图片交互和模型图片能力约束

- 修复旧脏会话幂等删除与前端会话恢复

easyflow-modules/easyflow-module-agent/src/main/java/tech/easyflow/agent/service/impl/AgentServiceImpl.java

@@ -249,6 +249,8 @@ public class AgentServiceImpl extends ServiceImpl<AgentMapper, Agent> implements
         summary.put("title", model.getTitle());
         summary.put("modelName", model.getModelName());
         summary.put("providerType", model.getModelProvider() == null ? null : model.getModelProvider().getProviderType());
+        summary.put("supportImage", Boolean.TRUE.equals(model.getSupportImage()));
+        summary.put("supportImageB64Only", Boolean.TRUE.equals(model.getSupportImageB64Only()));
         return summary;
     }