fix: improve cache management and sticker deletion

Update cache directory scanning to use platform-specific paths for iOS and Android.
Add a delay after clearing cache to ensure native deletion completes.
Correct the request body structure for sticker deletion API calls.

src/services/message/stickerService.ts

@@ -85,9 +85,8 @@ export const addStickerFromUrl = async (
  */
 export const deleteSticker = async (stickerId: string): Promise<boolean> => {
   try {
-    await api.delete('/stickers', {
-      data: { sticker_id: stickerId },
-    });
+    // api.delete(path, body) 的第二个参数直接作为请求体，不需要 axios 风格的 { data } 包装
+    await api.delete('/stickers', { sticker_id: stickerId });
     return true;
   } catch (error) {
     console.error('删除自定义表情失败:', error);
@@ -130,9 +129,7 @@ export const batchDeleteStickers = async (stickerIds: string[]): Promise<{ succe
   
   for (const stickerId of stickerIds) {
     try {
-      await api.delete('/stickers', {
-        data: { sticker_id: stickerId },
-      });
+      await api.delete('/stickers', { sticker_id: stickerId });
       success++;
     } catch (error) {
       console.error(`删除表情 ${stickerId} 失败:`, error);