Remove USDC product path; CoinOX is coin-margined only.

Drop USDC open/quote/swap APIs and env knobs; retarget hedge/settings copy to USDT/coin.

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

lib/hedge_plan/templates/hedge_plan_panel.html

@@ -53,7 +53,7 @@
         <details class="tip-collapse hp-rule-collapse">
           <summary class="tip-collapse-summary">规则说明</summary>
           <div class="tip-collapse-body rule-tip">
-            <p><strong>账户</strong>：永续腿走<strong>合约账户</strong>(USDT);期权腿走<strong>期权账户</strong>(USDC)。两账户分开下单、资金不互通。</p>
+            <p><strong>账户</strong>：永续腿走<strong>合约账户</strong>(USDT);期权腿走<strong>币本位</strong>(交易账户 USDT 买币开期权)。</p>
             <p><strong>模式</strong>：在 env <code>HEDGE_PLAN_OPTION_PRIMARY</code> 切换(true=以期权为主 / false=保险模式);标题前标识当前模式。</p>
             <p><strong>保险模式</strong>：做多配 Put、做空配 Call;左填开仓/止盈止损;仅实值/平值;交易所 TP/SL 出场。</p>
             <p><strong>以期权为主</strong>：填参后点「策略启动」进入<strong>盯盘</strong>(非现场开仓);杠杆/间隔达标后自动先开期权再市价永续。右侧列表仅展示达标候选。</p>
@@ -92,7 +92,7 @@
             <h3 id="hp-po-sec-capital" class="hp-po-section-title">资金与杠杆配置</h3>
             <div class="hp-po-fields hp-po-fields--section hp-po-fields--capital">
               <label class="hp-po-field">
-                <span class="hp-po-field-lab">权利金 <em>USDC</em></span>
+                <span class="hp-po-field-lab">权利金 <em>币</em></span>
                 <input type="number" step="any" id="hp-premium-budget" placeholder="预算(执行×0.95)" autocomplete="off" inputmode="decimal" data-lpignore="true" data-1p-ignore="true" data-form-type="other" />
               </label>
               <label class="hp-po-field">
@@ -211,7 +211,7 @@
         <details class="tip-collapse hp-rule-collapse">
           <summary class="tip-collapse-summary">规则说明</summary>
           <div class="tip-collapse-body rule-tip">
-            <p><strong>账户</strong>：两腿都在<strong>期权账户</strong>。可用预算 = min(交易 USDC × 对冲缓冲 <strong id="hp-oo-buf-ratio">{{ '%.2f'|format(hedge_plan_budget_buffer|default(0.95)|float) }}</strong>, 单笔预算);可在 env「对冲预算缓冲比例」改。</p>
+            <p><strong>账户</strong>：两腿都走<strong>币本位期权</strong>。可用预算 = min(交易 USDT × 对冲缓冲 <strong id="hp-oo-buf-ratio">{{ '%.2f'|format(hedge_plan_budget_buffer|default(0.95)|float) }}</strong>, 单笔预算);可在 env「对冲预算缓冲比例」改。</p>
             <p><strong>下单</strong>：选 Call + Put 后「计算」再「启动」。启动会再拉卖一并按最新价重算张数,IOC 完全成交才算成功;资金不足可在右侧划转。</p>
             <p><strong>板块</strong>：左填<strong>盈亏比</strong>(盈利金额÷总权利金,默认2)与张数模式(同张数/做多/做空);右 T 型选腿。<strong>两腿仅允许平值或虚值</strong>(禁实值)。出场:盈利腿达盈亏比即平;亏损腿「残值平」=本合约权利金跌至20%且有买一时平,「到期平」=持有至到期。</p>
           </div>
@@ -294,7 +294,7 @@
             <span>资金 <strong id="hp-oo-funding-usdc">—</strong></span>
             <span class="hp-oo-transfer-sep">·</span>
             <span>交易 <strong id="hp-oo-trading-usdc">—</strong></span>
-            <span class="hp-oo-transfer-unit">USDC</span>
+            <span class="hp-oo-transfer-unit">USDT</span>
             <span class="muted" id="hp-oo-xfer-msg"></span>
           </div>
           <div class="form-row hp-oo-transfer-form" autocomplete="off">
@@ -405,4 +405,4 @@
     </div>
   </div>
 </div>
-<script src="/static/hedge_plan.js?v=48"></script>
+<script src="/static/hedge_plan.js?v=49"></script>