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/AiPromptInput.test.ts

@@ -1,6 +1,6 @@
-import {mount} from '@vue/test-utils';
+import { mount } from '@vue/test-utils';
 
-import {describe, expect, it} from 'vitest';
+import { describe, expect, it } from 'vitest';
 
 import AiPromptInput from './AiPromptInput.vue';
 
@@ -9,10 +9,12 @@ describe('AiPromptInput', () => {
     const wrapper = mount(AiPromptInput, {
       props: {
         loading: false,
+        modelValue: '',
       },
     });
 
     await wrapper.find('textarea').setValue('你好');
+    await wrapper.setProps({ modelValue: '你好' });
     await wrapper.find('[aria-label="发送"]').trigger('click');
 
     expect(wrapper.emitted('send')?.[0]?.[0]).toBe('你好');
@@ -30,4 +32,62 @@ describe('AiPromptInput', () => {
 
     expect(wrapper.emitted('stop')).toBeTruthy();
   });
+
+  it('supports sending a ready image without text', async () => {
+    const wrapper = mount(AiPromptInput, {
+      props: {
+        images: [
+          {
+            localId: 'image-1',
+            mimeType: 'image/png',
+            name: 'test.png',
+            previewUrl: 'data:image/png;base64,AA==',
+            size: 1,
+            status: 'ready',
+            uploadId: 'upload-1',
+          },
+        ],
+        loading: false,
+      },
+    });
+
+    await wrapper.find('[aria-label="发送"]').trigger('click');
+
+    expect(wrapper.emitted('send')?.[0]?.[0]).toBe('');
+  });
+
+  it('extracts image files from clipboard paste', async () => {
+    const wrapper = mount(AiPromptInput, {
+      props: {
+        loading: false,
+      },
+    });
+    const image = new File(['image'], 'pasted.png', { type: 'image/png' });
+    const event = new Event('paste', { bubbles: true, cancelable: true });
+    Object.defineProperty(event, 'clipboardData', {
+      value: { files: [image] },
+    });
+
+    wrapper.find('textarea').element.dispatchEvent(event);
+    await wrapper.vm.$nextTick();
+
+    expect(event.defaultPrevented).toBe(true);
+    expect(wrapper.emitted('addFiles')?.[0]?.[0]).toEqual([image]);
+  });
+
+  it('extracts image files from drop', async () => {
+    const wrapper = mount(AiPromptInput, {
+      props: {
+        loading: false,
+      },
+    });
+    const image = new File(['image'], 'dropped.jpg', { type: 'image/jpeg' });
+    const text = new File(['text'], 'note.txt', { type: 'text/plain' });
+
+    await wrapper.find('.ai-prompt-input').trigger('drop', {
+      dataTransfer: { files: [image, text] },
+    });
+
+    expect(wrapper.emitted('addFiles')?.[0]?.[0]).toEqual([image]);
+  });
 });