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/api/admin/messages/route.ts

@@ -0,0 +1,27 @@
+import { NextResponse } from "next/server";
+import { isAdminAuthenticated } from "@/lib/admin-auth";
+import { listMessages } from "@/lib/db";
+
+export async function GET() {
+  const authenticated = await isAdminAuthenticated();
+  if (!authenticated) {
+    return NextResponse.json({ message: "Unauthorized" }, { status: 401 });
+  }
+
+  const messages = await listMessages();
+
+  return NextResponse.json({
+    messages: messages.map((row) => ({
+      id: row.id,
+      name: row.name,
+      email: row.email,
+      project: row.project,
+      requestType: row.request_type,
+      message: row.message,
+      createdAt: row.created_at,
+      repliedAt: row.replied_at,
+      adminReply: row.admin_reply,
+      status: row.status,
+    })),
+  });
+}