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/api/projects/[projectId]/agent-chat/route.ts

@@ -1,6 +1,5 @@
 import { NextRequest, NextResponse } from "next/server";
-import { getServerSession } from "next-auth/next";
-import { authOptions } from "@/lib/auth/authOptions";
+import { authSession } from "@/lib/auth/session-server";
 import { query } from "@/lib/db-postgres";
 
 const AGENT_RUNNER_URL = process.env.AGENT_RUNNER_URL ?? "http://localhost:3333";
@@ -87,7 +86,7 @@ export async function POST(
   req: NextRequest,
   { params }: { params: Promise<{ projectId: string }> }
 ) {
-  const session = await getServerSession(authOptions);
+  const session = await authSession();
   if (!session?.user?.email) {
     return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
   }
@@ -114,7 +113,6 @@ export async function POST(
         p.giteaRepo ? `Gitea repo: ${p.giteaRepo}` : null,
         p.coolifyAppUuid ? `Coolify app UUID: ${p.coolifyAppUuid}` : null,
         p.deploymentUrl ? `Live URL: ${p.deploymentUrl}` : null,
-        p.theiaWorkspaceUrl ? `IDE: ${p.theiaWorkspaceUrl}` : null,
       ].filter(Boolean);
       projectContext = lines.join("\n");
     }
@@ -190,7 +188,7 @@ export async function DELETE(
   _req: NextRequest,
   { params }: { params: Promise<{ projectId: string }> }
 ) {
-  const session = await getServerSession(authOptions);
+  const session = await authSession();
   if (!session?.user?.email) {
     return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
   }