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/(auth)/error/page.tsx

@@ -0,0 +1,39 @@
+'use client'
+
+import { useSearchParams } from 'next/navigation'
+import Link from 'next/link'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import { Button } from '@/components/ui/button'
+import { AlertCircle } from 'lucide-react'
+
+const errorMessages: Record<string, string> = {
+  Configuration: 'There is a problem with the server configuration.',
+  AccessDenied: 'You do not have access to this resource.',
+  Verification: 'The verification link has expired or already been used.',
+  Default: 'An error occurred during authentication.',
+}
+
+export default function AuthErrorPage() {
+  const searchParams = useSearchParams()
+  const error = searchParams.get('error') || 'Default'
+  const message = errorMessages[error] || errorMessages.Default
+
+  return (
+    <Card className="w-full 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">
+          <AlertCircle className="h-6 w-6 text-destructive" />
+        </div>
+        <CardTitle className="text-xl">Authentication Error</CardTitle>
+      </CardHeader>
+      <CardContent className="space-y-4 text-center">
+        <p className="text-muted-foreground">{message}</p>
+        <div className="border-t pt-4">
+          <Button asChild>
+            <Link href="/login">Try again</Link>
+          </Button>
+        </div>
+      </CardContent>
+    </Card>
+  )
+}