fix: 修復 Telegram Bot /menu 指令無響應及重複訊息問題

- telegram_bot_service: 新增 /menu 指令處理器，映射到 cmd_start
- openclaw_bot_routes: 優化「今日業績資料尚未匯入」訊息邏輯
  - 區分「資料載入異常」vs「確實未匯入」
  - 避免在已有今日資料時仍顯示未匯入訊息

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/telegram_bot_service.py

@@ -1062,6 +1062,7 @@ class TrendTelegramBot:
             # 註冊處理器
             self.application.add_handler(CommandHandler("start", self.cmd_start))
             self.application.add_handler(CommandHandler("help", self.cmd_help))
+            self.application.add_handler(CommandHandler("menu", self.cmd_start))  # /menu 指令映射到 cmd_start
             self.application.add_handler(CommandHandler("trend", self.cmd_trend))
             self.application.add_handler(CommandHandler("search", self.cmd_search))
             self.application.add_handler(CommandHandler("copy", self.cmd_copy))