docs: add comprehensive README.md and fix bugs

- add README.md with usage and deployment guide
- fix category sync logic in backend
- fix URL overflow in admin services list
- fix data caching issues in front-end and back-end
- add 'View Front-end' button in admin dashboard

app.py

@@ -43,12 +43,15 @@ def api_services():
     conn = get_db()
     cursor = conn.cursor()
 
+    # 查询时动态获取分类名
     cursor.execute('''
-        SELECT id, name, url, description, icon, category, sort_order,
-               health_check_enabled
-        FROM services
-        WHERE is_enabled = 1
-        ORDER BY sort_order DESC, id ASC
+        SELECT s.id, s.name, s.url, s.description, s.icon,
+               COALESCE(c.name, s.category) as category,
+               s.sort_order, s.health_check_enabled
+        FROM services s
+        LEFT JOIN categories c ON s.category = c.name
+        WHERE s.is_enabled = 1
+        ORDER BY s.sort_order DESC, s.id ASC
     ''')
 
     services = [dict(row) for row in cursor.fetchall()]
@@ -140,11 +143,14 @@ def api_admin_services():
     conn = get_db()
     cursor = conn.cursor()
 
+    # 查询时动态获取分类名（如果分类不存在则显示原始值）
     cursor.execute('''
-        SELECT id, name, url, description, icon, category, is_enabled,
-               sort_order, health_check_url, health_check_enabled
-        FROM services
-        ORDER BY sort_order DESC, id ASC
+        SELECT s.id, s.name, s.url, s.description, s.icon,
+               COALESCE(c.name, s.category) as category,
+               s.is_enabled, s.sort_order, s.health_check_url, s.health_check_enabled
+        FROM services s
+        LEFT JOIN categories c ON s.category = c.name
+        ORDER BY s.sort_order DESC, s.id ASC
     ''')
 
     services = [dict(row) for row in cursor.fetchall()]
@@ -327,16 +333,35 @@ def api_admin_update_category(category_id):
     conn = get_db()
     cursor = conn.cursor()
 
+    # 先获取旧的分类名
+    cursor.execute('SELECT name FROM categories WHERE id = ?', (category_id,))
+    old_row = cursor.fetchone()
+    if not old_row:
+        conn.close()
+        return jsonify({'error': '分类不存在'}), 404
+
+    old_name = old_row[0]
+    new_name = data.get('name', '')
+
+    # 更新分类表
     cursor.execute('''
         UPDATE categories
         SET name = ?, sort_order = ?
         WHERE id = ?
     ''', (
-        data.get('name', ''),
+        new_name,
         data.get('sort_order', 0),
         category_id
     ))
 
+    # 同步更新 services 表中该分类的服务
+    if old_name != new_name:
+        cursor.execute('''
+            UPDATE services
+            SET category = ?
+            WHERE category = ?
+        ''', (new_name, old_name))
+
     conn.commit()
     conn.close()