Apply 200k scope when CTP offline; trailing breakeven order UX.

When SimNow or live CTP is disconnected, default to the four-product whitelist regardless of reference capital. Trailing breakeven defaults off; when enabled hide take-profit and risk-reward, monitor exits via trailing stop only. Document both behaviors in TRADING.md and FEATURES.md.

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

templates/trade.html

@@ -77,7 +77,7 @@
                                 <input type="number" id="trade-price" step="any" placeholder="限价">
                                 <p class="hint market-hint" id="market-hint" hidden>市价以 FAK 即时成交报单（非限价挂单）</p>
                             </div>
-                            <div class="trade-field">
+                            <div class="trade-field" id="field-tp">
                                 <label class="text-label">止盈</label>
                                 <input type="number" id="trade-tp" step="any">
                             </div>
@@ -90,9 +90,10 @@
 
                     <div class="trade-action-row">
                         <label class="trailing-be-toggle">
-                            <input type="checkbox" id="trailing-be" checked>
+                            <input type="checkbox" id="trailing-be">
                             <span>移动保本</span>
                         </label>
+                        <p class="hint trailing-be-hint" id="trailing-be-hint" hidden>已开启：仅监控止损，达 1R 后移动保本平仓</p>
                         <span class="hint trade-rr-hint" id="trade-rr-hint" hidden></span>
                         <button type="button" class="btn-primary btn-open" id="btn-open">开仓</button>
                         <p class="hint session-hint text-muted" id="session-hint" hidden>不在交易时间段</p>