fix(api): 修復 34 個 Ruff lint 錯誤

- 自動修復 import 排序、unused imports
- 手動修復 raise from、isinstance union、unused variable
- scripts/ 暫時保留 (非 CI 阻擋)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/tests/test_telegram_integration.py

@@ -13,12 +13,11 @@ P1-4: Telegram 整合驗證測試
 建立者: Claude Code (P1-4 Telegram 驗證)
 """
 
-import pytest
 
 from src.services.telegram_gateway import (
+    RISK_EMOJI_MAP,
     SignOzMetricsBlock,
     TelegramMessage,
-    RISK_EMOJI_MAP,
 )
 
 # 本地定義 (避免 import 錯誤)