feat: add contact page with form handling and validation

- Implemented a contact page with a form for user inquiries.
- Added validation for form fields using Zod schema.
- Integrated PostgreSQL database for storing contact messages.
- Created necessary API endpoints for form submission.
- Added admin authentication and session management.
- Developed CGU, cookies policy, privacy policy, and legal mentions pages.
- Set up Docker configuration for PostgreSQL and application services.
- Enhanced UI with responsive design and accessibility features.

app/cookies/page.tsx

@@ -0,0 +1,15 @@
+export default function CookiesPage() {
+  return (
+    <main className="mx-auto max-w-3xl space-y-6 px-4 py-10 text-sm leading-relaxed text-slate-700 dark:text-slate-300">
+      <h1 className="text-3xl font-semibold text-slate-900 dark:text-white">Politique cookies</h1>
+      <section className="space-y-2">
+        <p>Ce site utilise un cookie technique pour la session admin (connexion au tableau de bord).</p>
+        <p>Aucun cookie publicitaire ou de tracking tiers n&apos;est depose par defaut.</p>
+      </section>
+      <section className="space-y-2">
+        <h2 className="text-lg font-semibold text-slate-900 dark:text-white">Session admin</h2>
+        <p>Le cookie admin est HttpOnly, SameSite=Lax et expire automatiquement.</p>
+      </section>
+    </main>
+  );
+}