ci: 部署完毕后自动清理 Cloudflare 边缘缓存

- 新增 purge-cache 步骤，在 deploy-pages 完成后自动调用 API 刷新全站缓存
- 彻底解决新版发布后，由于 CDN 强缓存导致浏览器请求旧 JS 文件报 404（Failed to fetch dynamically imported module）的版本偏差问题
- 优化流水线执行顺序，将缓存清理与 Telegram 成功通知配置为并行执行，避免增加构建耗时
- 更新失败通知的依赖项，并优化了发布成功的通知文案

.drone.yml

@@ -91,6 +91,22 @@ steps:
       - corepack enable
       - pnpm exec wrangler pages deploy .svelte-kit/cloudflare --project-name=blogflare --branch=main
 
+  - name: purge-cache
+    image: curlimages/curl:8.1.2
+    depends_on:
+      - deploy-pages
+    environment:
+      CLOUDFLARE_API_TOKEN:
+        from_secret: CLOUDFLARE_API_TOKEN
+      CLOUDFLARE_ZONE_ID:
+        from_secret: CLOUDFLARE_ZONE_ID
+    commands:
+      - |
+        curl -s -S -X POST "https://api.cloudflare.com/client/v4/zones/$CLOUDFLARE_ZONE_ID/purge_cache" \
+             -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
+             -H "Content-Type: application/json" \
+             --data '{"purge_everything":true}'
+
   - name: notify-success
     image: appleboy/drone-telegram
     depends_on:
@@ -109,7 +125,7 @@ steps:
 
         🔗 <b>构建详情：</b> <a href="{{ build.link }}">查看 Drone 运行记录</a>
 
-        🚀 全套改动现已全网完成发布部署！
+        🚀 全套改动现已全网完成发布部署！(缓存清理已在后台同步执行)
     when:
       status:
         - success
@@ -117,7 +133,9 @@ steps:
   - name: notify-failure
     image: appleboy/drone-telegram
     depends_on:
+      - deploy-db
       - deploy-pages
+      - purge-cache
     settings:
       token:
         from_secret: TELEGRAM_BOT_TOKEN