Fix maru version: v1.2.0 -> v1.2.1-20260410142843-d326b73
v1.2.0 tag doesn't exist on Docker Hub, causing compose build failures on de-27, de-32, us-40. Using the actual tag format. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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