docs(prd): add PRD V1.6 for deterministic image pipeline

需求基线从 PRD V0.3 升级到 V1.6:图片线由「AI 生成」改为确定性流水线
(PSD 套版 + 抠图 + 多规格合成),新增 R-29/R-30 与 Q-30~Q-32,
并补齐行业包、要素卡、视频逐镜、平台管理等章节。

影响面:仅文档,无代码影响。回滚方式:git revert 本提交。
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Stev_Wang committed 2026-11-02 15:09:51 +08:00
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