refactor: 移除收藏功能及相关代码

删除用户收藏表及相关SQL定义
移除前端收藏按钮及JavaScript逻辑
清理API中收藏相关接口
更新README文档移除收藏功能说明

version_list.php

@@ -139,7 +139,7 @@ while ($row = $result->fetch_assoc()) {
                                 <h5 class="card-title">版本 <?php echo htmlspecialchars($version['version']); ?></h5>
                                 <h6 class="card-subtitle mb-2 text-muted">发布日期: <?php echo date('Y-m-d', strtotime($version['created_at'])); ?></h6>
                                 <p class="card-text"><?php echo nl2br(htmlspecialchars($version['changelog'])); ?></p>
-                                <button class="btn btn-outline-secondary mt-2" onclick="toggleFavorite(<?php echo $appId; ?>, '<?php echo addslashes(htmlspecialchars($app['name'])); ?>')">收藏</button>
+                                
                             </div>
                             <div class="card-footer bg-transparent d-flex justify-content-between align-items-center">
                             <?php
@@ -193,22 +193,7 @@ $sizeText = formatFileSize($fileSize);
         <?php endif; ?>
     </div>
 
-    <!-- 收藏功能逻辑 -->
-    <script>
-        function toggleFavorite(appId, appName) {
-            let favorites = JSON.parse(localStorage.getItem('appFavorites')) || {};
-            
-            if (favorites[appId]) {
-                delete favorites[appId];
-                alert('已取消收藏 ' + appName);
-            } else {
-                favorites[appId] = appName;
-                alert('已收藏 ' + appName);
-            }
-            
-            localStorage.setItem('appFavorites', JSON.stringify(favorites));
-        }
-    </script>
+
     
     <!-- Bootstrap JS Bundle with Popper -->
     <script src="/js/bootstrap.bundle.min.js"></script>