移动端城市列表移除可交易城市过滤，始终显示全部监测城市

Constraint: MobileCityPicker 数据源仅使用 store.cities
Scope-risk: 仅影响 cityListRows 构建逻辑

frontend/components/dashboard/ScanTerminalDashboard.tsx

@@ -128,9 +128,9 @@ function ScanTerminalScreen() {
     [terminalData?.rows],
   );
 
-  const cityListRows = useMemo(() => {
+  const cityListRows = useMemo(
-    if (timeSortedRows.length > 0) return timeSortedRows;
+    () =>
-    return store.cities.map((city, index) => {
+      store.cities.map((city, index) => {
         const cityKey = normalizeCityKey(city.name);
         const summary =
           store.citySummariesByName[cityKey] ??
@@ -162,8 +162,9 @@ function ScanTerminalScreen() {
           closed: false,
           accepting_orders: false,
         } satisfies ScanOpportunityRow;
-    });
+      }),
-  }, [timeSortedRows, store.cities, store.citySummariesByName]);
+    [store.cities, store.citySummariesByName],
+  );
   const {
     addAiPinnedCity,
     aiPinnedCities,