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/components/admin-header.tsx

@@ -0,0 +1,116 @@
+"use client"
+
+import { Badge } from "@/components/ui/badge"
+import { Button } from "@/components/ui/button"
+import { Separator } from "@/components/ui/separator"
+import { Avatar, AvatarFallback } from "@/components/ui/avatar"
+import {
+  Languages,
+  Menu,
+  X,
+  LayoutDashboard,
+  Users,
+  Activity,
+  Settings,
+  ChevronLeft,
+  Shield,
+} from "lucide-react"
+import Link from "next/link"
+import { usePathname } from "next/navigation"
+import { useState } from "react"
+import { cn } from "@/lib/utils"
+
+const navItems = [
+  { label: "System Overview", href: "/admin", icon: LayoutDashboard },
+  { label: "User Management", href: "/admin", icon: Users },
+  { label: "Provider Status", href: "/admin", icon: Activity },
+  { label: "Settings", href: "/admin/settings", icon: Settings },
+]
+
+export function AdminHeader() {
+  const [mobileOpen, setMobileOpen] = useState(false)
+  const pathname = usePathname()
+
+  return (
+    <>
+      <header className="flex h-12 shrink-0 items-center justify-between border-b border-border bg-card px-3 lg:px-4">
+        {/* Mobile menu */}
+        <Button
+          variant="ghost"
+          size="icon-sm"
+          className="lg:hidden"
+          onClick={() => setMobileOpen(!mobileOpen)}
+          aria-label="Toggle menu"
+        >
+          {mobileOpen ? <X className="size-3.5" /> : <Menu className="size-3.5" />}
+        </Button>
+
+        {/* Mobile brand */}
+        <div className="flex items-center gap-1.5 lg:hidden">
+          <div className="flex size-5 items-center justify-center rounded bg-foreground">
+            <Languages className="size-2.5 text-background" />
+          </div>
+          <span className="text-xs font-semibold text-foreground">Admin</span>
+        </div>
+
+        {/* Desktop title */}
+        <div className="hidden items-center gap-2 lg:flex">
+          <h1 className="text-xs font-semibold text-foreground">System Administration</h1>
+          <Separator orientation="vertical" className="h-3" />
+          <span className="text-xs text-muted-foreground">Monitor infrastructure and manage users</span>
+        </div>
+
+        {/* Right side */}
+        <div className="flex items-center gap-2">
+          <Badge
+            variant="outline"
+            className="border-destructive/30 bg-destructive/5 text-destructive text-[10px] px-1.5 py-0"
+          >
+            <Shield className="mr-1 size-2.5" />
+            Superadmin
+          </Badge>
+          <Avatar className="size-6">
+            <AvatarFallback className="bg-foreground text-background text-[10px] font-semibold">
+              SA
+            </AvatarFallback>
+          </Avatar>
+        </div>
+      </header>
+
+      {/* Mobile nav */}
+      {mobileOpen && (
+        <div className="border-b border-border bg-card px-3 py-2 lg:hidden">
+          <nav className="flex flex-col gap-0.5">
+            {navItems.map((item) => {
+              const isActive = pathname === item.href
+              return (
+                <Link
+                  key={item.label}
+                  href={item.href}
+                  onClick={() => setMobileOpen(false)}
+                  className={cn(
+                    "flex items-center gap-2.5 rounded-md px-2.5 py-1.5 text-xs font-medium transition-colors",
+                    isActive
+                      ? "bg-secondary text-foreground"
+                      : "text-muted-foreground hover:bg-secondary/60 hover:text-foreground"
+                  )}
+                >
+                  <item.icon className="size-3.5 shrink-0" />
+                  {item.label}
+                </Link>
+              )
+            })}
+            <Separator className="my-1" />
+            <Link
+              href="/dashboard"
+              className="flex items-center gap-2.5 rounded-md px-2.5 py-1.5 text-xs font-medium text-muted-foreground hover:bg-secondary/60 hover:text-foreground"
+            >
+              <ChevronLeft className="size-3.5 shrink-0" />
+              User Dashboard
+            </Link>
+          </nav>
+        </div>
+      )}
+    </>
+  )
+}