Add Qingdao to the tradable city network

Qingdao needs the same airport-settlement path as the other Wunderground-backed APAC cities, so the registry, aliases, timezone, prewarm, official links, market focus, and tests now point to ZSQD / Qingdao Jiaodong International Airport.

Constraint: User supplied Wunderground Qingdao/ZSQD settlement URL.
Rejected: Add a partial registry-only entry | it would show in APIs without frontend links, prewarm coverage, or alias support.
Confidence: high
Scope-risk: narrow
Reversibility: clean
Tested: pytest tests/test_country_networks.py tests/test_web_observability.py::test_cities_endpoint_includes_new_wunderground_cities -q
Tested: npm run build
Not-tested: Live Wunderground fetch for ZSQD in production.

frontend/lib/dashboard-home-copy.ts

@@ -41,6 +41,7 @@ const CITY_NAME_ZH: Record<string, string> = {
   Panama: "巴拿马城",
   "Panama City": "巴拿马城",
   Paris: "巴黎",
+  Qingdao: "青岛",
   "Sao Paulo": "圣保罗",
   "São Paulo": "圣保罗",
   Seattle: "西雅图",
@@ -91,6 +92,7 @@ const AIRPORT_NAME_ZH: Record<string, string> = {
   "New York": "拉瓜迪亚机场",
   "Panama City": "托库门国际机场",
   Paris: "戴高乐机场",
+  Qingdao: "青岛胶东国际机场",
   "Sao Paulo": "瓜鲁柳斯国际机场",
   "São Paulo": "瓜鲁柳斯国际机场",
   Seattle: "西雅图-塔科马国际机场",

frontend/lib/dashboard-official-sources.ts

@@ -617,6 +617,23 @@ const CITY_SPECIFIC_SOURCES: Record<string, OfficialSourceLink[]> = {
       kind: "metar",
     },
   ],
+  qingdao: [
+    {
+      label: "Wunderground ZSQD",
+      href: "https://www.wunderground.com/history/daily/cn/qingdao/ZSQD",
+      kind: "agency",
+    },
+    {
+      label: "青岛胶东国际机场",
+      href: "https://www.qdairport.com/",
+      kind: "airport",
+    },
+    {
+      label: "ZSQD METAR",
+      href: "https://aviationweather.gov/data/metar/?id=ZSQD&decoded=1&taf=1",
+      kind: "metar",
+    },
+  ],
   "kuala lumpur": [
     {
       label: "Wunderground WMKK",

frontend/lib/polymarket-market-links.ts

@@ -25,6 +25,7 @@ const CITY_TO_MARKET_SLUG: Record<string, string> = {
   munich: "munich",
   "new york": "nyc",
   paris: "paris",
+  qingdao: "qingdao",
   "san francisco": "san-francisco",
   "sao paulo": "sao-paulo",
   seattle: "seattle",

frontend/lib/scan-market-focus.ts

@@ -107,6 +107,7 @@ const CITY_REGION_FALLBACK: Record<string, MarketRegionKey> = {
   chongqing: "asia_pacific",
   shenzhen: "asia_pacific",
   guangzhou: "asia_pacific",
+  qingdao: "asia_pacific",
   beijing: "asia_pacific",
   wuhan: "asia_pacific",
 };