feat: production deployment - full update with providers, admin, glossaries, pricing, tests

Major changes across backend, frontend, infrastructure:
- Provider system with model selection (Google, DeepL, OpenAI, Ollama, Google Cloud)
- Admin panel: user management, pricing, settings
- Glossary system with CSV import/export
- Subscription and tier quota management
- Security hardening (rate limiting, API key auth, path traversal fixes)
- Docker compose for dev, prod, and IONOS deployment
- Alembic migrations for new tables
- Frontend: dashboard, pricing page, landing page, i18n (en/fr)
- Test suite and verification scripts

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

office-translator-landing-page/app/admin/layout.tsx

@@ -0,0 +1,14 @@
+import type { Metadata } from "next"
+
+export const metadata: Metadata = {
+  title: "Admin - Office Translator",
+  description: "System administration and user management dashboard.",
+}
+
+export default function AdminLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return <>{children}</>
+}

office-translator-landing-page/app/admin/page.tsx

@@ -0,0 +1,36 @@
+"use client"
+
+import { AdminSidebar } from "@/components/admin-sidebar"
+import { AdminHeader } from "@/components/admin-header"
+import { SystemHealthCards } from "@/components/admin-system-health"
+import { ProviderStatus } from "@/components/admin-provider-status"
+import { UserManagementTable } from "@/components/admin-user-table"
+
+export default function AdminPage() {
+  return (
+    <div className="flex h-screen bg-background">
+      <AdminSidebar />
+
+      <div className="flex flex-1 flex-col overflow-hidden">
+        <AdminHeader />
+
+        <main className="flex-1 overflow-y-auto">
+          <div className="mx-auto max-w-6xl px-4 py-4 lg:px-6 lg:py-5">
+            {/* System Health Row */}
+            <SystemHealthCards />
+
+            {/* Provider Status Row */}
+            <div className="mt-3">
+              <ProviderStatus />
+            </div>
+
+            {/* User Management Table */}
+            <div className="mt-4">
+              <UserManagementTable />
+            </div>
+          </div>
+        </main>
+      </div>
+    </div>
+  )
+}