🔧 完善system_config初始化字段

- INSERT 语句补全所有字段，确保与 CREATE TABLE 定义一致

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database.py

@@ -235,8 +235,9 @@ def init_database():
             cursor.execute('''
                 INSERT INTO system_config (
                     id, max_concurrent_global, max_concurrent_per_account, max_screenshot_concurrent,
-                    schedule_enabled, schedule_time, schedule_browse_type, schedule_weekdays
-                ) VALUES (1, 2, 1, 3, 0, '02:00', '应读', '1,2,3,4,5,6,7')
+                    schedule_enabled, schedule_time, schedule_browse_type, schedule_weekdays,
+                    proxy_enabled, proxy_api_url, proxy_expire_minutes, enable_screenshot
+                ) VALUES (1, 2, 1, 3, 0, '02:00', '应读', '1,2,3,4,5,6,7', 0, '', 3, 1)
             ''')
             conn.commit()
             print("✓ 已创建系统配置(默认并发2,定时任务关闭)")