feat: 套餐按钮根据用户会员状态显示

- 当前套餐：绿色disabled按钮
- 已升级：灰色disabled按钮
- 未登录/低等级：显示购买按钮
- pricing路由传递user对象

app.py

@@ -206,7 +206,8 @@ def history():
 @app.route('/pricing')
 def pricing():
     """会员定价页"""
-    return render_template('pricing.html', plans=MEMBERSHIP_PLANS)
+    user = get_current_user()
+    return render_template('pricing.html', plans=MEMBERSHIP_PLANS, user=user)
 
 
 # ==================== 路由: API ====================

templates/pricing.html

@@ -24,7 +24,7 @@
         
         <div class="row justify-content-center">
             <!-- 免费用户 -->
-            <div class="col-md-3 mb-4">
+            <div class="col-lg-3 col-md-6 mb-4">
                 <div class="card pricing-card h-100">
                     <div class="card-body text-center">
                         <h4 class="card-title">免费用户</h4>
@@ -40,13 +40,19 @@
                             <li class="text-muted">❌ 批量翻译</li>
                         </ul>
                         
+                        {% if user and user.user_type in ['free', 'vip_basic', 'vip_pro', 'vip_enterprise', 'admin'] %}
+                        <span class="btn btn-secondary w-100 mt-3 disabled">
+                            {% if user.user_type == 'free' %}当前套餐{% else %}已升级{% endif %}
+                        </span>
+                        {% else %}
                         <a href="/register" class="btn btn-outline-secondary w-100 mt-3">免费注册</a>
+                        {% endif %}
                     </div>
                 </div>
             </div>
             
             <!-- 基础会员 -->
-            <div class="col-md-4 mb-4">
+            <div class="col-lg-3 col-md-6 mb-4">
                 <div class="card pricing-card h-100">
                     <div class="card-body text-center">
                         <h4 class="card-title">基础会员</h4>
@@ -62,13 +68,19 @@
                             <li>✅ 优先处理队列</li>
                         </ul>
                         
+                        {% if user and user.user_type == 'vip_basic' %}
+                        <span class="btn btn-success w-100 mt-3 disabled">当前套餐</span>
+                        {% elif user and user.user_type in ['vip_pro', 'vip_enterprise', 'admin'] %}
+                        <span class="btn btn-secondary w-100 mt-3 disabled">已升级</span>
+                        {% else %}
                         <button class="btn btn-outline-primary w-100 mt-3">立即购买</button>
+                        {% endif %}
                     </div>
                 </div>
             </div>
             
             <!-- 专业会员 -->
-            <div class="col-md-4 mb-4">
+            <div class="col-lg-3 col-md-6 mb-4">
                 <div class="card pricing-card h-100 border-primary">
                     <div class="card-header bg-primary text-white text-center">
                         <strong>推荐</strong>
@@ -86,13 +98,19 @@
                             <li>✅ 自定义术语库</li>
                         </ul>
                         
+                        {% if user and user.user_type == 'vip_pro' %}
+                        <span class="btn btn-success w-100 mt-3 disabled">当前套餐</span>
+                        {% elif user and user.user_type in ['vip_enterprise', 'admin'] %}
+                        <span class="btn btn-secondary w-100 mt-3 disabled">已升级</span>
+                        {% else %}
                         <button class="btn btn-primary w-100 mt-3">立即购买</button>
+                        {% endif %}
                     </div>
                 </div>
             </div>
             
             <!-- 企业会员 -->
-            <div class="col-md-4 mb-4">
+            <div class="col-lg-3 col-md-6 mb-4">
                 <div class="card pricing-card h-100">
                     <div class="card-body text-center">
                         <h4 class="card-title">企业会员</h4>
@@ -106,7 +124,11 @@
                             <li>✅ API接口调用</li>
                         </ul>
                         
+                        {% if user and user.user_type in ['vip_enterprise', 'admin'] %}
+                        <span class="btn btn-success w-100 mt-3 disabled">当前套餐</span>
+                        {% else %}
                         <button class="btn btn-outline-primary w-100 mt-3">联系购买</button>
+                        {% endif %}
                     </div>
                 </div>
             </div>