Initial fullstack project setup with Next.js 15, Gin, PostgreSQL and Docker Compose

- Frontend: Next.js 15 (App Router), Auth.js v5, shadcn/ui, MagicUI
- Backend: Go + Gin + GORM with layered architecture
- Auth: Local credentials login with optional Keycloak OAuth binding
- Admin: RBAC user management for admin role
- Dev: Docker Compose with hot reload for both frontend and backend
- Docker: 3-service orchestration (frontend, backend, postgres)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/app/api/auth/[...nextauth]/route.ts

@@ -0,0 +1,3 @@
+import { GET, POST } from "@/auth";
+
+export { GET, POST };

frontend/app/api/proxy/[[...path]]/route.ts

@@ -0,0 +1,48 @@
+import { auth } from "@/auth";
+import { NextRequest, NextResponse } from "next/server";
+
+const BACKEND_URL = process.env.SERVER_API_URL || "http://backend:8080";
+
+async function handler(
+  req: NextRequest,
+  { params }: { params: Promise<{ path?: string[] }> }
+) {
+  const session = await auth();
+  const { path } = await params;
+  const pathStr = path?.join("/") || "";
+  const url = `${BACKEND_URL}/api/${pathStr}${req.nextUrl.search}`;
+
+  const headers = new Headers(req.headers);
+  headers.delete("host");
+
+  if (session?.user) {
+    headers.set("X-User-Id", (session.user as any).id || "");
+    headers.set("X-User-Role", (session.user as any).role || "");
+  }
+
+  const body =
+    req.method === "GET" || req.method === "HEAD"
+      ? undefined
+      : await req.arrayBuffer();
+
+  const res = await fetch(url, {
+    method: req.method,
+    headers,
+    body,
+  });
+
+  const data = await res.arrayBuffer();
+
+  return new NextResponse(data, {
+    status: res.status,
+    statusText: res.statusText,
+    headers: res.headers,
+  });
+}
+
+export const GET = handler;
+export const POST = handler;
+export const PUT = handler;
+export const DELETE = handler;
+export const PATCH = handler;
+export const OPTIONS = handler;