Fix empty dashboard fallback and websocket gating

frontend/src/components/StatisticsView.jsx

@@ -360,7 +360,7 @@ export default function StatisticsView({ trades, holdings, stats, baseline_vw, e
               </div>
 
               {/* Ticker Weights - Compact */}
-              {stats.tickerWeights && Object.keys(stats.tickerWeights).length > 0 && (
+              {effectiveStats?.tickerWeights && Object.keys(effectiveStats.tickerWeights).length > 0 && (
                 <div style={{
                   marginTop: 'auto',
                   paddingTop: 20,
@@ -382,7 +382,7 @@ export default function StatisticsView({ trades, holdings, stats, baseline_vw, e
                     gap: 8,
                     maxHeight: 120
                   }}>
-                    {Object.entries(stats.tickerWeights).map(([ticker, weight]) => {
+                    {Object.entries(effectiveStats.tickerWeights).map(([ticker, weight]) => {
                       const weightValue = Number(weight);
                       const isNegative = weightValue < 0;
                       const displayWeight = (weightValue * 100).toFixed(1);

frontend/src/services/websocket.js

@@ -24,13 +24,13 @@ export async function fetchGatewayPort() {
     if (data.is_running && data.port) {
       cachedGatewayPort = data.port;
       cachedWsUrl = data.ws_url;
-      return { port: data.port, wsUrl: data.ws_url };
+      return { status: "running", port: data.port, wsUrl: data.ws_url };
     }
 
-    return null;
+    return { status: "stopped", port: data.port || null, wsUrl: data.ws_url || null };
   } catch (error) {
     console.warn('[Gateway] Failed to fetch port:', error);
-    return null;
+    return { status: "unavailable", port: null, wsUrl: null };
   }
 }
 
@@ -86,15 +86,29 @@ export class ReadOnlyClient {
     // Resolve WebSocket URL if not set
     let targetUrl = this.wsUrl;
     if (!targetUrl) {
-      // Try to fetch from API first
       const gatewayInfo = await fetchGatewayPort();
-      if (gatewayInfo) {
+      if (gatewayInfo?.status === "running" && gatewayInfo.wsUrl) {
         targetUrl = gatewayInfo.wsUrl;
         console.log(`[WebSocket] Resolved Gateway port: ${gatewayInfo.port}`);
-      } else {
-        // Fallback to default
+      } else if (gatewayInfo?.status === "unavailable") {
         targetUrl = WS_URL;
         console.log(`[WebSocket] Using default URL: ${targetUrl}`);
+      } else {
+        this.isConnecting = false;
+        this._safeEmit({
+          type: "system",
+          content: "运行任务尚未启动，等待数据服务上线..."
+        });
+
+        if (this.shouldReconnect) {
+          if (this.reconnectTimer) {
+            clearTimeout(this.reconnectTimer);
+          }
+          this.reconnectTimer = setTimeout(() => {
+            this._connect();
+          }, this.reconnectDelay);
+        }
+        return;
       }
     }