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/app/src/components/ai-chat/useChatImageUploads.test.ts

@@ -0,0 +1,62 @@
+import { nextTick, watchEffect } from 'vue';
+
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { useChatImageUploads } from './useChatImageUploads';
+
+const mediaApi = vi.hoisted(() => ({
+  deleteAgentChatImage: vi.fn(),
+  uploadAgentChatImage: vi.fn(),
+}));
+
+vi.mock('./mediaApi', () => mediaApi);
+
+describe('useChatImageUploads', () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+    mediaApi.deleteAgentChatImage.mockReset();
+    mediaApi.uploadAgentChatImage.mockReset();
+  });
+
+  it('reactively exposes the ready state after upload', async () => {
+    let resolveUpload: (value: any) => void = () => undefined;
+    mediaApi.uploadAgentChatImage.mockReturnValue(
+      new Promise((resolve) => {
+        resolveUpload = resolve;
+      }),
+    );
+    vi.spyOn(URL, 'createObjectURL').mockReturnValue('blob:test-image');
+    vi.spyOn(URL, 'revokeObjectURL').mockImplementation(() => undefined);
+
+    const uploads = useChatImageUploads();
+    const observedStatuses: (string | undefined)[] = [];
+    const stop = watchEffect(() => {
+      observedStatuses.push(uploads.items.value[0]?.status);
+    });
+    const pending = uploads.addFiles(
+      [new File(['image'], 'test.png', { type: 'image/png' })],
+      { agentId: 'agent-1', mode: 'FORMAL', sessionId: 'session-1' },
+    );
+    await nextTick();
+
+    resolveUpload({
+      data: {
+        height: 1,
+        mimeType: 'image/png',
+        name: 'test.png',
+        previewUrl: '/api/v1/agent/media/content?reference=draft%3Atest',
+        size: 5,
+        uploadId: 'upload-1',
+        width: 1,
+      },
+      errorCode: 0,
+    });
+    await pending;
+    await nextTick();
+    stop();
+
+    expect(observedStatuses).toContain('uploading');
+    expect(observedStatuses.at(-1)).toBe('ready');
+    expect(uploads.uploadIds.value).toEqual(['upload-1']);
+  });
+});