feat(界面): 添加KIRO账号购买链接及样式

在控制台头部添加KIRO账号购买链接，并为其设计渐变背景和悬停效果

static/app/styles.css

@@ -394,6 +394,36 @@ body {
     transition: transform 0.3s ease;
 }
 
+/* KIRO 购买链接 */
+.kiro-buy-link {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.5rem 1rem;
+    background: linear-gradient(135deg, var(--warning-color) 0%, #f97316 100%);
+    color: var(--white);
+    text-decoration: none;
+    border-radius: 9999px;
+    font-size: 0.875rem;
+    font-weight: 600;
+    transition: var(--transition);
+    box-shadow: 0 2px 8px var(--warning-30);
+}
+
+.kiro-buy-link:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 4px 12px var(--warning-40);
+    background: linear-gradient(135deg, #f97316 0%, var(--warning-color) 100%);
+}
+
+.kiro-buy-link:active {
+    transform: translateY(0);
+}
+
+.kiro-buy-link i {
+    font-size: 0.875rem;
+}
+
 /* 高亮说明样式 */
 .highlight-note {
     display: inline-flex;

static/index.html

@@ -17,6 +17,9 @@
             <div class="header-content">
                 <h1><i class="fas fa-robot"></i> <span class="header-title" data-i18n="header.title">AIClient2API 管理控制台</span></h1>
                 <div class="header-controls">
+                    <a href="https://pay.ldxp.cn/shop/N0IK02WR" target="_blank" rel="noopener noreferrer" class="kiro-buy-link" title="KIRO账号购买">
+                        <i class="fas fa-shopping-cart"></i> <span>KIRO账号购买</span>
+                    </a>
                     <span class="status-badge" id="serverStatus">
                         <i class="fas fa-circle"></i> <span class="status-text" data-i18n="header.status.connecting">连接中...</span>
                     </span>