Launch the AFTERLIGHT Signal Reliquary portal

[Luskish]

Summary

• adds the Signal Reliquary themed AFTERLIGHT portal at /afterlight
• discovers canonical launcher assets from the AFTERLIGHT GitHub release
• provides Prism, CurseForge, and Modrinth download paths with recovery guidance
• upgrades the static Astro toolchain and adds repository security gates
• validates every emitted Astro island and generated internal reference

Verification

• 121 local tests passed
• six static routes built and validated
• desktop and mobile browser acceptance passed
• zero npm advisories
• independent task review and three scoped security re-reviews passed

Release hold

Keep this PR in draft until the complete AFTERLIGHT release publishes all canonical launcher assets. Netlify preview and GitHub CI may run now. Production merge follows verified live download discovery.

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