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

@@ -23,8 +23,36 @@
         <h2 class="text-center mb-5">会员套餐</h2>
         
         <div class="row justify-content-center">
+            <!-- 免费用户 -->
+            <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>
+                        <div class="price my-3">¥0<small>/永久</small></div>
+                        
+                        <ul class="features text-start">
+                            <li>✅ 每日翻译10次</li>
+                            <li>✅ 单文件最大50页</li>
+                            <li>✅ 翻译历史记录</li>
+                            <li>✅ 不满意重新翻译</li>
+                            <li>✅ 导出PDF格式</li>
+                            <li class="text-muted">❌ 原文译文对比</li>
+                            <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>
@@ -34,17 +62,25 @@
                             <li>✅ 每日翻译50次</li>
                             <li>✅ 单文件最大100页</li>
                             <li>✅ 翻译历史记录</li>
-                            <li>✅ 优先处理队列</li>
+                            <li>✅ 不满意重新翻译</li>
+                            <li>✅ 原文译文对比查看</li>
                             <li>✅ 导出PDF格式</li>
+                            <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>
@@ -57,17 +93,24 @@
                             <li>✅ 每日翻译200次</li>
                             <li>✅ 单文件最大500页</li>
                             <li>✅ 所有基础会员功能</li>
+                            <li>✅ 原文译文对比查看</li>
                             <li>✅ 批量翻译</li>
                             <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>
@@ -81,7 +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>
@@ -148,7 +195,7 @@
                         <tr>
                             <td>对比查看</td>
                             <td class="text-danger">❌</td>
-                            <td class="text-success">✅</td>
+                            <td class="text-danger">❌</td>
                             <td class="text-success">✅</td>
                             <td class="text-success">✅</td>
                             <td class="text-success">✅</td>
@@ -156,7 +203,7 @@
                         <tr>
                             <td>导出PDF</td>
                             <td class="text-danger">❌</td>
-                            <td class="text-danger">❌</td>
+                            <td class="text-success">✅</td>
                             <td class="text-success">✅</td>
                             <td class="text-success">✅</td>
                             <td class="text-success">✅</td>
@@ -177,6 +224,14 @@
                             <td class="text-success">✅</td>
                             <td class="text-success">✅</td>
                         </tr>
+                        <tr>
+                            <td>自定义翻译要求</td>
+                            <td class="text-danger">❌</td>
+                            <td class="text-danger">❌</td>
+                            <td class="text-danger">❌</td>
+                            <td class="text-danger">❌</td>
+                            <td class="text-success">✅</td>
+                        </tr>
                         <tr>
                             <td>API调用</td>
                             <td class="text-danger">❌</td>