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-												feat: 预设素材库 - 4 套主题 × 4 张图 = 16 张 PNG

主题：classical 古典宫廷（王子/皇后/国王/小丑）
      modern    现代人物（小孩/女青年/男青年/小丑鱼）
      astronomy 天文（星星/月亮/太阳/黑洞）
      minimal   简笔符号（圆点/♀/♂/叉）

改动：
- 新增 LibraryAsset 模型（全局素材库，theme_id/role/asset_id 索引）
- 新增 seed_library 管理命令，用 Pillow 画 16 张 PNG 素材
- 新增 /api/projects/library/ 列表 API
- 新增 /api/projects/{pid}/library/{id}/apply/ 应用 API
  把预设素材复制到 projects/<pid>/joker 或 face_card 下，作为该牌位的素材
- AssetPanel 加 tab 切换：「我的素材」+「预设主题」，主题可筛选、点击套用到当前牌
- 修复 generate_card_png 的 joker asset 匹配 bug：which 应该是 card_key（含前缀）才能匹配 asset_key

设计要点：
- 预设素材只画上半身（y=0~150），下半留空，让系统的'自动对称'流水线正确工作
- 预设素材 PNG 200×300，深色描边 + 半透明浅色填充，在任意牌面背景上叠加都清晰

											
										
										
											2026-06-02 14:39:52 +08:00
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