完成 lau fau shan → shenzhen 全量重命名，前端库和文档同步更新

src/data_collection/city_time.py

@@ -34,7 +34,7 @@ CITY_TIME_ZONES = {
     "jeddah": "Asia/Riyadh",
     "karachi": "Asia/Karachi",
     "kuala lumpur": "Asia/Kuala_Lumpur",
-    "lau fau shan": "Asia/Hong_Kong",
+    "shenzhen": "Asia/Hong_Kong",
     "london": "Europe/London",
     "los angeles": "America/Los_Angeles",
     "lucknow": "Asia/Kolkata",
@@ -54,7 +54,6 @@ CITY_TIME_ZONES = {
     "seattle": "America/Los_Angeles",
     "seoul": "Asia/Seoul",
     "shanghai": "Asia/Shanghai",
-    "shenzhen": "Asia/Shanghai",
     "singapore": "Asia/Singapore",
     "taipei": "Asia/Taipei",
     "tel aviv": "Asia/Jerusalem",