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-ui-admin/packages/effects/common-ui/src/components/chat-timeline/ChatTimeline.vue

@@ -1,11 +1,12 @@
 <script setup lang="ts">
 import type {
   ChatTimelineItem as ChatTimelineItemType,
+  ChatImageLoader,
   ChatTimelineMessageItem,
   ChatTimelineToolApprovalPayload,
 } from './types';
 
-import {nextTick, onBeforeUnmount, ref, watch} from 'vue';
+import { nextTick, onBeforeUnmount, ref, watch } from 'vue';
 
 import ChatTimelineItem from './ChatTimelineItem.vue';
 
@@ -13,6 +14,7 @@ const props = defineProps<{
   approvalLoading?: boolean;
   copyable?: (item: ChatTimelineMessageItem) => boolean;
   emptyText?: string;
+  imageLoader?: ChatImageLoader;
   items: ChatTimelineItemType[];
   regenerable?: (item: ChatTimelineMessageItem) => boolean;
   regenerateDisabled?: boolean;
@@ -153,6 +155,7 @@ watch(
         :key="item.id"
         :assistant-actions-visible="isAssistantActionAnchor(item, index, items)"
         :item="item"
+        :image-loader="imageLoader"
         :approval-loading="approvalLoading"
         :copyable="canCopyMessage(item)"
         :regenerable="canRegenerateMessage(item)"