feat(media): 支持后台转码配置与缩略图轴

sql/data-phase1.sql

@@ -338,5 +338,17 @@ INSERT INTO sys_config (id, config_key, config_value, remark) VALUES
   (4, 'app.register.max-per-device-per-day', '0', '0=不限制；生产建议 3')
 ON CONFLICT (config_key) DO NOTHING;
 
+INSERT INTO sys_config (id, config_key, config_value, remark) VALUES
+  (2026102201,
+   'media.transcode.profile',
+   '{"enabled":true,"segmentSeconds":6,"ladder":[' ||
+   '{"quality":"360p","width":640,"height":360,"videoBitrateKbps":400,"audioBitrateKbps":64,"enabled":true},' ||
+   '{"quality":"480p","width":854,"height":480,"videoBitrateKbps":800,"audioBitrateKbps":64,"enabled":true},' ||
+   '{"quality":"720p","width":1280,"height":720,"videoBitrateKbps":1600,"audioBitrateKbps":96,"enabled":true},' ||
+   '{"quality":"1080p","width":1920,"height":1080,"videoBitrateKbps":3200,"audioBitrateKbps":128,"enabled":true}],' ||
+   '"sprite":{"enabled":true,"intervalSeconds":1,"columns":10,"thumbWidth":160}}',
+   '转码档位与缩略图轴配置')
+ON CONFLICT (config_key) DO NOTHING;
+
 -- K23：二级菜单统一只显示文字，历史图标值也一并清空。
 UPDATE sys_menu SET icon = '' WHERE type = 'MENU';