feat: V2 microservices stack — backend services, gateway, JWT auth

Add full V2 architecture: identity, content, studio (.NET 10) and file,
render, notification, gateway (Go) services with vendored deps, plus DB
migrations, event/API contracts, and an init-db script.

Wire the Next.js frontend to the gateway: server-side JWT auth routes
(login/register/refresh/logout/me), gateway fetch helper, and session/
cookie/jwt helpers under src/lib.

Containerize the stack via docker-compose.v2.yml and per-service
Dockerfiles. Base images resolve through a Nexus mirror (Docker Hub) and
MCR directly; npm/NuGet pull from Nexus groups. Self-host fonts via
next/font/local to avoid Google Fonts (geo-blocked).

Add CI workflow and ignore .env.v2, *.stackdump, and .NET bin/obj.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/app/[locale]/dashboard/layout.tsx

@@ -1,7 +1,7 @@
 import { redirect } from "next/navigation";
 
 import { DashboardShell } from "@/components/dashboard/DashboardShell";
-import { createClient } from "@/lib/supabase/server";
+import { getCurrentUser } from "@/lib/auth/session";
 
 export const dynamic = "force-dynamic";
 
@@ -10,24 +10,16 @@ export default async function DashboardLayout({
 }: Readonly<{
   children: React.ReactNode;
 }>) {
-  const supabase = await createClient();
-  const {
-    data: { user },
-  } = await supabase.auth.getUser();
+  const user = await getCurrentUser();
 
   if (!user) {
     redirect("/auth");
   }
 
-  const userName =
-    typeof user.user_metadata?.full_name === "string"
-      ? user.user_metadata.full_name
-      : null;
-
   return (
     <DashboardShell
       userEmail={user.email ?? ""}
-      userName={userName}
+      userName={user.full_name ?? null}
       userId={user.id}
     >
       {children}