修复 CI: 适配 MobileCityPicker 测试断言 + 清理 f-string 和无用 import

- removedMonitorRunwayTabs.test.ts: 检查 MobileCityPicker 替代旧 scan-mobile-city-list-view
- stableServerRefreshPolicy.test.ts: 同上，MobileCityPicker 替代旧视图标识
- scan_forum_topics.py: 移除无占位符的 f-string 和无用 json import

scripts/scan_forum_topics.py

@@ -1,7 +1,6 @@
 """扫描群组内所有 Forum Topic，打印名称和 thread_id。"""
 from __future__ import annotations
 
-import json
 import os
 import sys
 from concurrent.futures import ThreadPoolExecutor, as_completed
@@ -52,7 +51,7 @@ def main() -> int:
         print("未设置 TELEGRAM_BOT_TOKEN", file=sys.stderr)
         return 1
 
-    print(f"扫描群组话题...")
+    print("扫描群组话题...")
     topics = []
     with ThreadPoolExecutor(max_workers=10) as pool:
         futures = {pool.submit(_try_get_topic, tid): tid for tid in range(1, 101)}