feat: 所有参数移至config.json, 重构退出逻辑, 清理遗留接口

- 将所有硬编码参数迁移到 config.json (手续费率、止盈/止损阈值、
  超时、腿间隔、加仓步进等)
- 退出条件: 净利 >= take_profit_pct 止盈, 价差 <= 0 平仓
- 删除 Binance/dYdX 遗留代码
- 更新 README 文档
- Dashboard: 双交易所价格表、黑名单UI、按币名排序持仓
- Bitget WS: 文本ping保活
- 数据库: 重置, 无历史仓位

web/static/index.html

@@ -27,14 +27,14 @@
         <div class="stat"><label>收敛</label><span id="stat-converged" class="pct-green">0</span></div>
         <div class="stat"><label>发散</label><span id="stat-diverged" class="pct-red">0</span></div>
         <div class="stat"><label>持平</label><span id="stat-flat" class="pct-gray">0</span></div>
-        <div class="stat"><label>持仓</label><span id="stat-positions" class="pct-yellow">0</span></div>
+        <div class="stat"><label>持仓</label><span id="stat-positions" class="pct-yellow">0 / <span id="stat-max-pos">5</span></span></div>
         <div class="stat"><label>币种</label><span id="stat-coins" class="pct-blue">0</span></div>
         <div class="stat" id="conn-stats"><label>连接</label><span id="conn-detail"></span></div>
       </div>
       <!-- Detailed PnL stats -->
       <div class="stats-row detail-stats" style="margin-top:4px;font-size:12px;opacity:0.85">
         <div class="stat"><label>总PnL</label><span id="stat-total-pnl">—</span></div>
-        <div class="stat"><label>平均PnL</label><span id="stat-avg-pnl">—</span></div>
+        <div class="stat"><label>本金</label><span id="stat-capital">—</span></div>
         <div class="stat"><label>胜率</label><span id="stat-win-rate">—</span></div>
         <div class="stat"><label>最多盈利</label><span id="stat-max-profit">—</span></div>
         <div class="stat"><label>最多亏损</label><span id="stat-max-loss">—</span></div>
@@ -42,16 +42,24 @@
       </div>
     </section>
 
+    <!-- Blacklist -->
+    <section class="card" id="bl-card">
+      <h2>⛔ 黑名单</h2>
+      <div class="stats-row" id="bl-body">
+        <span class="text-dim">暂无</span>
+      </div>
+    </section>
+
     <!-- Price Table -->
     <section class="card" id="prices-card">
       <h2>💰 实时价格 <span id="prices-age" class="text-dim" style="font-size:11px"></span></h2>
       <div class="table-wrap">
         <table id="price-table">
           <thead>
-            <tr><th>币种</th><th>Binance</th><th>HyperLiquid</th><th>Bitget</th><th>dYdX</th><th>BG↔HL价差</th></tr>
+            <tr><th>币种</th><th>HyperLiquid</th><th>Bitget</th><th>BG↔HL价差</th></tr>
           </thead>
           <tbody id="price-body">
-            <tr><td colspan="6" class="loading">等待数据...</td></tr>
+            <tr><td colspan="4" class="loading">等待数据...</td></tr>
           </tbody>
         </table>
       </div>