Isolate CTP in worker process and improve strategy roll UX.

Split vn.py into qihuo-ctp worker with IPC client bridge, keep CTP connected during breaks with cached account fallback, speed up strategy page loads, and allow off-session breakout roll submissions.

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

static/js/strategy.js

@@ -109,6 +109,7 @@
         var breakEl = document.getElementById('roll-break-price');
         var execHint = document.getElementById('roll-exec-hint');
         var btnExec = document.getElementById('btn-roll-exec');
+        var btnPreview = document.getElementById('btn-roll-preview');
         if (!modeEl) return;
         var mode = modeEl.value || 'market';
         var isBreak = mode === 'breakout';
@@ -120,6 +121,12 @@
         if (btnExec) {
             btnExec.textContent = mode === 'market' ? '执行滚仓' : '提交监控';
         }
+        if (btnPreview) {
+            btnPreview.disabled = !inTradingSession && !isBreak;
+            btnPreview.title = (!inTradingSession && !isBreak)
+                ? '休盘期间请切换为突破加仓'
+                : '';
+        }
     }
 
     function syncRollRiskHint() {
@@ -196,6 +203,7 @@
     var rollPayload = null;
     var rollMonitorSel = document.getElementById('roll-monitor-select');
     var rollModeSel = document.getElementById('roll-add-mode');
+    var inTradingSession = {{ 'true' if trading_session else 'false' }};
 
     if (rollModeSel) rollModeSel.addEventListener('change', syncRollModeUi);
     if (rollMonitorSel) rollMonitorSel.addEventListener('change', syncRollRiskHint);
@@ -214,6 +222,7 @@
                 }
                 showPreview(rollPrev, formatRoll(d.preview), true, false);
                 btnRollE.hidden = false;
+                syncRollModeUi();
             }).finally(function () {
                 btnRollP.disabled = false;
             });
@@ -224,6 +233,10 @@
             var payload = rollPayload || formData(rollForm);
             var mode = (payload.add_mode || 'market');
             if (mode === 'market') {
+                if (!inTradingSession) {
+                    alert('休盘期间请切换为「突破加仓」后提交监控');
+                    return;
+                }
                 if (!confirm('确认执行市价滚仓？')) return;
                 startRollCountdown(btnRollE, payload);
                 return;