Rip out Theia, ship P5.1 attach E2E + Justine UI work-in-progress

Theia rip-out:
- Delete app/api/theia-auth/route.ts (Traefik ForwardAuth shim)
- Delete app/api/projects/[projectId]/workspace/route.ts and
  app/api/projects/prewarm/route.ts (Cloud Run Theia provisioning)
- Delete lib/cloud-run-workspace.ts and lib/coolify-workspace.ts
- Strip provisionTheiaWorkspace + theiaWorkspaceUrl/theiaAppUuid/
  theiaError from app/api/projects/create/route.ts response
- Remove Theia callbackUrl branch in app/auth/page.tsx
- Drop "Open in Theia" button + xterm/Theia PTY copy in build/page.tsx
- Drop theiaWorkspaceUrl from deployment/page.tsx Project type
- Strip Theia IDE line + theia-code-os from advisor + agent-chat
  context strings
- Scrub Theia mention from lib/auth/workspace-auth.ts comment

P5.1 (custom apex domains + DNS):
- lib/coolify.ts + lib/opensrs.ts: nameserver normalization, OpenSRS
  XML auth, Cloud DNS plumbing
- scripts/smoke-attach-e2e.ts: full prod GCP + sandbox OpenSRS +
  prod Coolify smoke covering register/zone/A/NS/PATCH/cleanup

In-progress (Justine onboarding/build, MVP setup, agent telemetry):
- New (justine)/stories, project (home) layouts, mvp-setup, run, tasks
  routes + supporting components
- Project shell + sidebar + nav refactor for the Stackless palette
- Agent session API hardening (sessions, events, stream, approve,
  retry, stop) + atlas-chat, advisor, design-surfaces refresh
- New scripts/sync-db-url-from-coolify.mjs +
  scripts/prisma-db-push.mjs + docker-compose.local-db.yml for
  local Prisma workflows
- lib/dev-bypass.ts, lib/chat-context-refs.ts, lib/prd-sections.ts
- Misc: stories CSS, debug/prisma route, modal-theme, BuildLivePlanPanel

Made-with: Cursor

app/auth/layout.tsx

@@ -1,4 +1,20 @@
+import type { Metadata } from "next";
+import { Plus_Jakarta_Sans } from "next/font/google";
 import { Toaster } from "sonner";
+import { JustineAuthShell } from "@/marketing/components/justine/JustineAuthShell";
+import "../styles/justine/02-signup.css";
+
+const justineJakarta = Plus_Jakarta_Sans({
+  subsets: ["latin"],
+  weight: ["400", "500", "600", "700", "800"],
+  variable: "--font-justine-jakarta",
+  display: "swap",
+});
+
+export const metadata: Metadata = {
+  title: "Sign in · vibn",
+  description: "Sign in to your vibn workspace with Google.",
+};
 
 export default function AuthLayout({
   children,
@@ -6,10 +22,12 @@ export default function AuthLayout({
   children: React.ReactNode;
 }) {
   return (
-    <>
-      {children}
+    <div
+      data-justine-auth
+      className={`${justineJakarta.variable} justine-auth-root flex min-h-screen flex-col`}
+    >
+      <JustineAuthShell>{children}</JustineAuthShell>
       <Toaster position="top-center" />
-    </>
+    </div>
   );
 }
-