Match options branding: title prefix and ETH/BTC header quotes.

Use 「加密货币 | OKX 对冲」 and show live top-right ETHUSDT/BTCUSDT quotes like the options instance.

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

lib/instance/templates/instance_brand_header.html

@@ -0,0 +1,24 @@
+{# 顶栏品牌标题 + 右上角 ETH/BTC 报价(与期权仓同款) #}
+<div class="header header--brand">
+    <h1 class="brand-title">
+        <span class="brand-prefix">加密货币</span>
+        <span class="brand-sep" aria-hidden="true">|</span>
+        <span class="brand-product">OKX 对冲</span>
+    </h1>
+    <div class="header-live-quotes" id="header-live-quotes" aria-label="ETH/BTC 行情">
+        <div class="hlq-row" data-base="ETH">
+            <span class="hlq-icon hlq-icon--eth" aria-hidden="true"></span>
+            <span class="hlq-sym">ETHUSDT</span>
+            <span class="hlq-last" data-hlq="last">—</span>
+            <span class="hlq-chg" data-hlq="chg">—</span>
+            <span class="hlq-pct" data-hlq="pct">—</span>
+        </div>
+        <div class="hlq-row" data-base="BTC">
+            <span class="hlq-icon hlq-icon--btc" aria-hidden="true"></span>
+            <span class="hlq-sym">BTCUSDT</span>
+            <span class="hlq-last" data-hlq="last">—</span>
+            <span class="hlq-chg" data-hlq="chg">—</span>
+            <span class="hlq-pct" data-hlq="pct">—</span>
+        </div>
+    </div>
+</div>