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/providers.tsx

@@ -0,0 +1,58 @@
+'use client'
+
+import { useState } from 'react'
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { httpBatchLink } from '@trpc/client'
+import superjson from 'superjson'
+import { trpc } from '@/lib/trpc/client'
+
+function makeQueryClient() {
+  return new QueryClient({
+    defaultOptions: {
+      queries: {
+        staleTime: 60 * 1000, // 1 minute
+        refetchOnWindowFocus: false,
+      },
+    },
+  })
+}
+
+let browserQueryClient: QueryClient | undefined = undefined
+
+function getQueryClient() {
+  if (typeof window === 'undefined') {
+    // Server: always make a new query client
+    return makeQueryClient()
+  } else {
+    // Browser: make a new query client if we don't already have one
+    if (!browserQueryClient) browserQueryClient = makeQueryClient()
+    return browserQueryClient
+  }
+}
+
+function getBaseUrl() {
+  if (typeof window !== 'undefined') return ''
+  if (process.env.VERCEL_URL) return `https://${process.env.VERCEL_URL}`
+  return `http://localhost:${process.env.PORT ?? 3000}`
+}
+
+export function Providers({ children }: { children: React.ReactNode }) {
+  const queryClient = getQueryClient()
+
+  const [trpcClient] = useState(() =>
+    trpc.createClient({
+      links: [
+        httpBatchLink({
+          url: `${getBaseUrl()}/api/trpc`,
+          transformer: superjson,
+        }),
+      ],
+    })
+  )
+
+  return (
+    <trpc.Provider client={trpcClient} queryClient={queryClient}>
+      <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
+    </trpc.Provider>
+  )
+}