fix(release): per-binary archives + dist ignore

One archive can't span builds with different target sets (dash ships 6,
dash-agent 3) — split into two archives keyed by build id. Also: `builds`
is deprecated in goreleaser v2, renamed to `ids`. Snapshot validated
locally: 9 archives, checksums, embedded UI, migrations on boot.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitignore

@@ -20,6 +20,7 @@ data/*
 # misc
 .DS_Store
 coverage/
+dist/
 
 # local tooling artifacts
 .playwright-mcp/