docs: add BytePlus sponsor entry to README (en/zh/ja)

Insert sponsor row in all three README locales. EN/JA point to
byteplus.com/modelark; ZH points to volcengine.com/agentplan
(Volcengine being the China-region counterpart). Logo normalized
to the project-standard 1920x798 RGB white background and
recompressed (432K -> 84K).
This commit is contained in:
Jason
2026-05-09 23:03:08 +08:00
parent 5bbd83f7ca
commit 10c874afdc
4 changed files with 15 additions and 0 deletions
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