kdletters
4a2b270714
补齐游戏分发封面与截图的冻结、上传与展示
- 服务端：游戏表追加可空 cover_object_key / screenshots_json，版本表追加可空 metadata_json，创建版本时校验必需封面、最多 6 张截图与图片素材归属，并从素材记录派生对象键生成冻结资料。
- 服务端：审核通过时把冻结资料整体生效到游戏行；只有已公开且存在有效活动版本的游戏，其封面/截图素材才在 /api/assets/read-url 获得匿名读授权。
- 服务端：作者与管理员回读版本时追加 frozenMetadata，带回封面与截图素材 ID 供续发复用，公开投影仍只暴露对象键。
- 网页：/games/publish 新增「封面与截图」区，复用平台图片直传与 confirm 通道，缺封面或截图超量在发请求前拦截，更新版本时按冻结资料回填且不要求重新上传。
- 网页：游戏广场卡片与详情页 hero 换签展示真实封面，详情页新增可点击的截图缩略图条，无素材或换签失败时静默回退原有渐变占位。
- AGC：发布面板支持封面必选与截图最多 6 张，新增素材直传服务并在创建游戏前拦截缺封面，同一文件重复提交复用素材 ID。
- AGC：http 能力作用域新增阿里云 OSS 直传地址，客户端同时校验直传目标必须是平台素材存储。
- 契约与文档：同步 shared-contracts、packages/shared 契约，更新 SpacetimeDB 迁移注释、后端架构、玩法链路与实施计划文档，并补齐网页端与 AGC 定向测试。
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