0.2.6：sendFile 暫時性錯誤自動重試、Claude 模型增加 Opus 4.8/4.6/Haiku 4.5、列表沙盒欄精簡

- telegram.js：sendFile 遇到 Bad Gateway/Gateway Timeout/429 等暫時性錯誤時自動重試最多 3 次（間隔遞增 4s/8s/12s）
- server.js：Claude 模型清單增加 Opus 4.8、Opus 4.6、Haiku 4.5
- index.html：沙盒欄第二行只顯示模型/effort，其餘資訊（會話模式、連網、可寫成員、規範）改為滑鼠停留氣泡顯示

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "telegram-bot",
-  "version": "0.2.1",
+  "version": "0.2.6",
   "description": "Telegram bot powered by your local AI CLI (OpenAI Codex or Claude Code) — zero-dependency, pm2-managed, with a web console to manage multiple bots",
   "license": "MIT",
   "type": "commonjs",