docs(logo): 归档 logo 草稿、v1–v4 探索稿与真实印章调研

v1 为 Codex 精细化的草稿 1;v2–v4 为 SVG 程序化模拟印泥质感的尝试。
调研结论:印泥质感本质上是位图,改用位图生成后矢量化。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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YANG JIANKUAN
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