feat: 添加图片库功能，支持选择和展示不同类别的图片

src/component/Canvas/CanvasEditor/components/HeaderMenu.vue

@@ -318,6 +318,13 @@ onMounted(() => {
             <span class="color-dropdown">▼</span>
           </div>
         </div>
+
+        <!-- 菜单扩展插槽 -->
+        <template v-if="$slots.existsImageList">
+          <div class="setting-group">
+            <slot name="existsImageList" />
+          </div>
+        </template>
       </div>
 
       <!-- <div class="setting-group">

src/component/Canvas/CanvasEditor/index.vue

@@ -795,7 +795,12 @@ defineExpose({
         @update:brushSize="brushSize = $event"
         @canvas-size-change="updateCanvasSize"
         @canvas-color-change="updateCanvasColor"
-      />
+      >
+        <!-- 菜单扩展插槽 -->
+        <template #existsImageList>
+          <slot name="existsImageList" />
+        </template>
+      </HeaderMenu>
     </div>
 
     <div class="main-content">