Add pre-buy expiry breakeven columns to options chain table.

Show estimated expiry balance and distance from index in the chain list and order panel using ask price before opening a position.

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

lib/options/options_pricing_lib.py

@@ -134,6 +134,18 @@ def option_moneyness_label(moneyness: str) -> str:
     return {"itm": "实值", "otm": "虚值", "atm": "平值"}.get((moneyness or "").lower(), "")
 
 
+def expiry_breakeven_from_ask(
+    *,
+    opt_type: str,
+    strike: float | None,
+    ask_px: float | None,
+    mark_px: float | None = None,
+) -> float | None:
+    """买入前预估到期平衡：权利金按卖一；无卖一时回退标记价。"""
+    prem = ask_px if ask_px is not None and ask_px > 0 else mark_px
+    return expiry_breakeven_px(opt_type=opt_type, strike=strike, avg_px=prem)
+
+
 def expiry_breakeven_px(
     *,
     opt_type: str,

lib/options/templates/options_panel.html

@@ -7,7 +7,7 @@
     <div class="options-dual-grid">
         <div class="card options-order-card">
             <h2>期权下单</h2>
-            <p class="muted options-hint">报价单位为每 1 ETH/BTC；1 张 = 0.01。链展示近 <span id="opt-chain-dte">14</span> 日到期，标注实值/虚值。资金划转与 USDT/USDC 兑换见「系统设置 → 期权设置」。</p>
+            <p class="muted options-hint">报价单位为每 1 ETH/BTC；1 张 = 0.01。链展示近 <span id="opt-chain-dte">14</span> 日到期，标注实值/虚值；<strong>到期平衡</strong>按卖一预估（无卖一按标记价）。资金划转与 USDT/USDC 兑换见「系统设置 → 期权设置」。</p>
             <div class="form-row options-chain-toolbar">
                 <button type="button" class="btn-secondary opt-uly-btn active" data-uly="ETH">ETH</button>
                 <button type="button" class="btn-secondary opt-uly-btn" data-uly="BTC">BTC</button>
@@ -26,11 +26,13 @@
                             <th>合约</th>
                             <th>卖一</th>
                             <th>买一</th>
+                            <th>到期平衡</th>
+                            <th>距平衡</th>
                             <th>操作</th>
                         </tr>
                     </thead>
                     <tbody id="opt-strike-tbody">
-                        <tr><td colspan="6" class="muted">请选择到期日</td></tr>
+                        <tr><td colspan="8" class="muted">请选择到期日</td></tr>
                     </tbody>
                 </table>
             </div>
@@ -43,6 +45,8 @@
                         <div><span class="k">张数</span><span id="opt-order-sheets" class="v">—</span></div>
                         <div><span class="k">ETH/BTC 数量</span><span id="opt-order-eth" class="v">—</span></div>
                         <div><span class="k">预估权利金</span><span id="opt-order-premium" class="v">—</span></div>
+                        <div><span class="k">到期平衡</span><span id="opt-order-expiry-be" class="v">—</span></div>
+                        <div><span class="k">距平衡</span><span id="opt-order-dist-be" class="v">—</span></div>
                     </div>
                     <div class="form-row options-order-mode-row">
                         <label><input type="radio" name="opt-size-mode" value="sheets" checked> 指定张数</label>