feat: 盈亏比与亏损额度展示，市价FAK报单，修复止盈止损保存失败

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

templates/trade.html

@@ -67,7 +67,7 @@
                                     <button type="button" class="price-tab" data-type="market">市价</button>
                                 </div>
                                 <input type="number" id="trade-price" step="any" placeholder="限价">
-                                <p class="hint market-hint" id="market-hint" hidden>市价将按最新行情价报单</p>
+                                <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">
                                 <label class="text-label">止盈</label>
@@ -85,6 +85,7 @@
                             <input type="checkbox" id="trailing-be" checked>
                             <span>移动保本</span>
                         </label>
+                        <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>
                         <p class="trade-order-msg" id="order-msg" hidden></p>