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

marketing/components/justine/JustineAuthShell.tsx

@@ -0,0 +1,21 @@
+import Link from "next/link";
+
+/** Compact nav from justine/02_signup.html — use inside [data-justine-auth] + 02-signup.css */
+export function JustineAuthShell({ children }: { children: React.ReactNode }) {
+  return (
+    <>
+      <nav className="justine-auth-nav" aria-label="Auth">
+        <Link href="/" className="justine-auth-nav-brand">
+          <div className="justine-auth-nav-logo">
+            <span className="f">V</span>
+          </div>
+          <span className="justine-auth-nav-wordmark f">vibn</span>
+        </Link>
+        <span className="justine-auth-nav-aside">
+          New to vibn? <Link href="/">View homepage</Link>
+        </span>
+      </nav>
+      <div className="justine-auth-main">{children}</div>
+    </>
+  );
+}