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/components/shared/page-header.tsx

@@ -0,0 +1,32 @@
+import { cn } from '@/lib/utils'
+
+interface PageHeaderProps {
+  title: string
+  description?: string
+  children?: React.ReactNode
+  className?: string
+}
+
+export function PageHeader({
+  title,
+  description,
+  children,
+  className,
+}: PageHeaderProps) {
+  return (
+    <div
+      className={cn(
+        'flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between',
+        className
+      )}
+    >
+      <div>
+        <h1 className="text-2xl font-semibold tracking-tight">{title}</h1>
+        {description && (
+          <p className="text-muted-foreground">{description}</p>
+        )}
+      </div>
+      {children && <div className="flex items-center gap-2">{children}</div>}
+    </div>
+  )
+}