fix: include default LGSM query handler

[MarcStdt]

Summary

• add a shared LGSM query coldstarter handler used when a variant has no version-specific handler
• regenerate sdtdserver so packet_handler/query.lua is present in the artifact
• validate coldstarter handler files for every scroll, not only Minecraft

Validation

• go run ./scripts/validate-scrolls.go
• ./scripts/validate_all_scrolls.sh
• git diff --check

[druid-infra]

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