fix: init_db兼容旧数据库，自动添加缺失的系统配置字段

backend/app.py

@@ -276,6 +276,20 @@ def init_db():
         ]
         for key, value, desc in default_configs:
             cursor.execute('INSERT INTO system_configs (key, value, description) VALUES (?, ?, ?)', (key, value, desc))
+    else:
+        # 检查并添加缺失的配置项（兼容旧数据库）
+        default_configs = [
+            ('app_developer', 'OpenClaw Team', '开发者'),
+            ('app_update_date', '2026-04-27', '更新日期'),
+            ('app_technology', '智谱 GLM-4.5-Air 大模型', '技术基础'),
+            ('app_description', '提供智能对话、多种智能体服务', '应用简介'),
+            ('privacy_policy_url', '', '隐私政策链接'),
+            ('user_agreement_url', '', '用户协议链接'),
+        ]
+        for key, value, desc in default_configs:
+            cursor.execute('SELECT COUNT(*) FROM system_configs WHERE key=?', (key,))
+            if cursor.fetchone()[0] == 0:
+                cursor.execute('INSERT INTO system_configs (key, value, description) VALUES (?, ?, ?)', (key, value, desc))
     
     # 初始化管理员账户
     cursor.execute('SELECT COUNT(*) FROM admin_users')