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/routes.ts

@@ -0,0 +1,14 @@
+import { type RouteConfig, index, route } from "@react-router/dev/routes"
+
+export default [
+  index("routes/home.tsx"),
+  route("resources", "routes/resources.tsx"),
+  route("activity", "routes/activity.tsx"),
+  route("assistant", "routes/assistant.tsx"),
+  route("ai", "routes/ai.tsx"),
+  route("library", "routes/library.tsx"),
+  route("settings", "routes/settings.tsx"),
+  route("profile", "routes/profile.tsx"),
+  route("login", "routes/login.tsx"),
+  // CREMA:ROUTES
+] satisfies RouteConfig