feat: module translations (spec 019 T090, T091)

[ValgulNecron]

Before: module bundles carry only the template text, so the dashboard can show module names, settings and actions only in English.

After: a module can ship locales/<tag>.json. build.sh pushes each file as its own OCI layer, CI checks every module that has locales, and Minecraft Java, Terraria and Valheim ship a generated locales/en.json that translators start from.

How: build.sh adds one layer per locales/<tag>.json except en.json, with media type application/vnd.gameplane.module.locale.v1+json and the file name as its title, so the operator finds it. The validate workflow runs i18n-check --module from the main repo on every module with a locales/ folder. The en.json files were generated with gp-module i18n extract, not written by hand. A new root README explains how to add a language.

Merge order: this needs GameplanePanel/Gameplane#668 merged into master first, because the CI step installs i18n-check from master. The root modules pointer is bumped only after this PR merges.

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[ValgulNecron]

validate fails at the new "Check module locales" step with github.com/GameplanePanel/gameplane@master ... does not contain package .../i18n/cmd/i18n-check. That is expected for now: the i18n/ module only exists on GameplanePanel/Gameplane#668, which hasn't merged yet. Commit 251da8f moves that step to the end so the existing build.sh and validate.py tests still run and report first. Once #668 is on master, a re-run of this job should pass with no further change. The PR stays a draft until then.

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