init: arcadia-admin — admin webapp for arcadia-core, cloned from vibespace

Initial commit. Spun up via the docs/STARTER.md recipe: cp from vibespace,
reset git, rename package, set brand to "Arcadia Admin" with Shield icon
in app/lib/identity.ts.

Inherits the full Crema sibling-lib wiring including @crema/arcadia-client
(typed HTTP + Phoenix Channels realtime against arcadia-core) and
@crema/arcadia-auth-ui (login/signup/password-reset/2FA forms). The /login
route already renders <LoginForm>; <ArcadiaProvider> in app/root.tsx reads
VITE_ARCADIA_URL (default localhost:4000) and VITE_ARCADIA_TENANT (default
"default").

CLAUDE.md and README rewritten to frame this as the admin app for
arcadia-core. docs/STARTER.md removed — arcadia-admin is a leaf consumer,
not a downstream starter.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/components/ui/aspect-ratio.tsx

@@ -0,0 +1,22 @@
+import { cn } from "~/lib/utils"
+
+function AspectRatio({
+  ratio,
+  className,
+  ...props
+}: React.ComponentProps<"div"> & { ratio: number }) {
+  return (
+    <div
+      data-slot="aspect-ratio"
+      style={
+        {
+          "--ratio": ratio,
+        } as React.CSSProperties
+      }
+      className={cn("relative aspect-(--ratio)", className)}
+      {...props}
+    />
+  )
+}
+
+export { AspectRatio }