fix: 网页端套餐只保留包月和包年，移除永久

src/handlers/payment.rs

@@ -376,18 +376,6 @@ pub async fn payment_index() -> Result<HttpResponse, AppError> {
     </div>
   </div>
 
-  <div class="pkg-card" data-package="permanent" onclick="selectPackage('permanent')">
-    <div class="pkg-tag orange">超值</div>
-    <div class="pkg-name">永久会员</div>
-    <div class="pkg-price" style="color:#ff6b00;">¥199<span class="unit">/终身</span></div>
-    <div class="pkg-desc">一次购买，终身享用</div>
-    <div class="pkg-features">
-      <div class="pkg-feature">无限次检测额度</div>
-      <div class="pkg-feature">查看完整历史记录</div>
-      <div class="pkg-feature">优先体验新功能</div>
-    </div>
-  </div>
-
   <button class="btn-pay" id="payBtn" onclick="goPay()" disabled>请先选择套餐</button>
   <button class="btn-logout" onclick="logout()">退出登录</button>
   <div class="notice" style="margin-top:16px">支付成功后额度将自动到账</div>
@@ -507,10 +495,10 @@ pub async fn payment_index() -> Result<HttpResponse, AppError> {
     document.querySelectorAll('.pkg-card').forEach(c => c.classList.remove('selected'));
     document.querySelector('[data-package="' + pkg + '"]').classList.add('selected');
     var btn = document.getElementById('payBtn');
-    var labels = { monthly: '立即开通 - ¥9.9/月', yearly: '立即开通 - ¥59/年', permanent: '立即开通 - ¥199/终身' };
+    var labels = { monthly: '立即开通 - ¥9.9/月', yearly: '立即开通 - ¥59/年' };
     btn.textContent = labels[pkg];
     btn.disabled = false;
-    btn.className = 'btn-pay' + (pkg === 'permanent' ? ' orange' : '');
+    btn.className = 'btn-pay';
   }
 
   function goPay() {