feat: Phase 1 — socle backend FastAPI + frontend Next.js

Backend (FastAPI + SQLAlchemy):
- Modèles : User, Client, Audit, Cible, Vulnérabilité, Action
- Auth JWT (register/login/me) avec bcrypt
- Routes CRUD complets : clients, audits, cibles, vulnérabilités, actions
- Schémas Pydantic v2, migrations Alembic configurées
- Rate limiting (slowapi), CORS, structure scanners/reports pour phase 2

Frontend (Next.js 14 App Router):
- shadcn/ui : Button, Input, Card, Badge, Label
- Page login avec gestion token JWT
- Dashboard avec stats temps réel
- Pages Clients (grille) et Audits (liste) avec recherche
- Layout avec sidebar navigation + protection auth
- Dockerfiles multi-stage (backend + frontend standalone)

Infrastructure:
- docker-compose.yml : postgres, redis, backend, frontend
- docker-compose.prod.yml avec labels Traefik
- .env.example complet
- .gitignore mis à jour

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/components/layout/header.tsx

@@ -0,0 +1,21 @@
+"use client";
+
+import { Bell } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+interface HeaderProps {
+  title: string;
+}
+
+export function Header({ title }: HeaderProps) {
+  return (
+    <header className="flex items-center justify-between border-b px-6 py-4 bg-background">
+      <h1 className="text-xl font-semibold">{title}</h1>
+      <div className="flex items-center gap-2">
+        <Button variant="ghost" size="icon">
+          <Bell className="h-5 w-5" />
+        </Button>
+      </div>
+    </header>
+  );
+}

frontend/components/layout/sidebar.tsx

@@ -0,0 +1,64 @@
+"use client";
+
+import Link from "next/link";
+import { usePathname } from "next/navigation";
+import { Shield, Users, ClipboardList, LayoutDashboard, LogOut } from "lucide-react";
+import { cn } from "@/lib/utils";
+import { removeToken } from "@/lib/auth";
+import { useRouter } from "next/navigation";
+
+const navItems = [
+  { href: "/dashboard", label: "Tableau de bord", icon: LayoutDashboard },
+  { href: "/clients", label: "Clients", icon: Users },
+  { href: "/audits", label: "Audits", icon: ClipboardList },
+];
+
+export function Sidebar() {
+  const pathname = usePathname();
+  const router = useRouter();
+
+  function handleLogout() {
+    removeToken();
+    router.push("/login");
+  }
+
+  return (
+    <aside className="flex h-screen w-64 flex-col border-r bg-card">
+      {/* Logo */}
+      <div className="flex items-center gap-2 px-6 py-5 border-b">
+        <Shield className="h-7 w-7 text-primary" />
+        <span className="text-xl font-bold">AuditShield</span>
+      </div>
+
+      {/* Navigation */}
+      <nav className="flex-1 px-3 py-4 space-y-1">
+        {navItems.map(({ href, label, icon: Icon }) => (
+          <Link
+            key={href}
+            href={href}
+            className={cn(
+              "flex items-center gap-3 rounded-md px-3 py-2 text-sm font-medium transition-colors",
+              pathname.startsWith(href)
+                ? "bg-primary text-primary-foreground"
+                : "text-muted-foreground hover:bg-accent hover:text-accent-foreground"
+            )}
+          >
+            <Icon className="h-4 w-4" />
+            {label}
+          </Link>
+        ))}
+      </nav>
+
+      {/* Logout */}
+      <div className="px-3 py-4 border-t">
+        <button
+          onClick={handleLogout}
+          className="flex w-full items-center gap-3 rounded-md px-3 py-2 text-sm font-medium text-muted-foreground hover:bg-accent hover:text-accent-foreground transition-colors"
+        >
+          <LogOut className="h-4 w-4" />
+          Déconnexion
+        </button>
+      </div>
+    </aside>
+  );
+}