为微信小游戏添加周排行

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@user_c830ad09/wechat-weekly-leaderboard

Add or fix a weekly high-score friend leaderboard in a WeChat mini game. Use when working on native Canvas JavaScript mini games that need open data domain leaderboards, wx.setUserCloudStorage reporting, wx.getFriendCloudStorage rendering, weekly reset/filtering, sharedCanvas drawing, local fallback scores, ranking panels, or bugs where the friend ranking flashes then falls back to only local/self score.