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>

apps/backend/internal/web/dist/index.html

@@ -12,8 +12,8 @@
         document.documentElement.dataset.theme = t === "light" ? "light" : "dark";
       } catch (e) {}
     </script>
-    <script type="module" crossorigin src="/assets/index-LtBmkZex.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-CoYED22n.css">
+    <script type="module" crossorigin src="/assets/index-WK6y87Wv.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-CHTjdWqd.css">
   </head>
   <body>
     <div id="root"></div>