Initial commit: MOPC platform with Docker deployment setup

Full Next.js 15 platform with tRPC, Prisma, PostgreSQL, NextAuth.
Includes production Dockerfile (multi-stage, port 7600), docker-compose
with registry-based image pull, Gitea Actions CI workflow, nginx config
for portal.monaco-opc.com, deployment scripts, and DEPLOYMENT.md guide.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(admin)/error.tsx

@@ -0,0 +1,55 @@
+'use client'
+
+import { useEffect } from 'react'
+import Link from 'next/link'
+import { Button } from '@/components/ui/button'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import { AlertTriangle, RefreshCw, LayoutDashboard } from 'lucide-react'
+
+export default function AdminError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string }
+  reset: () => void
+}) {
+  useEffect(() => {
+    console.error('Admin section error:', error)
+  }, [error])
+
+  return (
+    <div className="flex min-h-[50vh] items-center justify-center p-4">
+      <Card className="max-w-md">
+        <CardHeader className="text-center">
+          <div className="mx-auto mb-4 flex h-12 w-12 items-center justify-center rounded-full bg-destructive/10">
+            <AlertTriangle className="h-6 w-6 text-destructive" />
+          </div>
+          <CardTitle>Something went wrong</CardTitle>
+        </CardHeader>
+        <CardContent className="space-y-4 text-center">
+          <p className="text-muted-foreground">
+            An error occurred while loading this admin page. Please try again or
+            return to the dashboard.
+          </p>
+          <div className="flex justify-center gap-2">
+            <Button onClick={reset} variant="outline">
+              <RefreshCw className="mr-2 h-4 w-4" />
+              Try Again
+            </Button>
+            <Button asChild>
+              <Link href="/admin">
+                <LayoutDashboard className="mr-2 h-4 w-4" />
+                Dashboard
+              </Link>
+            </Button>
+          </div>
+          {error.digest && (
+            <p className="text-xs text-muted-foreground">
+              Error ID: {error.digest}
+            </p>
+          )}
+        </CardContent>
+      </Card>
+    </div>
+  )
+}