fix: 重启后立即读库展示持仓，CTP异步重连不再阻塞

Co-authored-by: Cursor <cursoragent@cursor.com>

static/js/trade.js

@@ -111,6 +111,10 @@
 
     function savePosCache(data) {
         try {
+            if (!data || !data.rows || !data.rows.length) {
+                var prev = loadPosCache();
+                if (prev && prev.rows && prev.rows.length) return;
+            }
             sessionStorage.setItem(POS_CACHE_KEY, JSON.stringify(data));
         } catch (e) { /* quota */ }
     }
@@ -947,6 +951,7 @@
         }
         pollPositions();
         connectPositionStream();
+        requestCtpConnect(false);
         connectRecommendStream();
         fetch('/api/recommend/list')
             .then(function (r) { return r.json(); })