【P3】
【PAGE_IDENTITY】
画布：严格3:4，1080×1440。只生成并直接显示当前这一张独立3:4图片。不得生成其他任务内容。
【A. 固定继承部分】
BEGIN_LOCKED_REPEATED_PAGE_TEMPLATE
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固定素材和最高优先级约束优先；不得重绘产品包装、Logo或改变固定素材；动态槽位外禁止修改。字号、行高、卡片尺寸固定，文字溢出时报 CONTENT_OVERFLOW。
FIXED_PRODUCT_CONTRACT: {"bindings":[],"required_material_ids":[],"requires_product":false}
【B. 变体表达部分】
【本方案的差异点】只替换允许的狗狗与文字槽位。
BEGIN_DYNAMIC_CONTENT
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END_DYNAMIC_CONTENT
【组内首张生成锚点】本页先独立生成。质量检查通过后，工作台保存本次实际图片、计算SHA256并冻结结构签名，再把状态更新为READY。开始本页不需要任何外部排版参考图。
只改允许的狗狗和文字槽位，背景、标题样式、花纹、卡片、边框和页脚不得重新设计。