feat: enhance environment configuration and CORS handling

- Added `NEXT_PUBLIC_APP_URL` and `NEXT_PUBLIC_CONTACT_EMAIL` to environment variables for frontend configuration.
- Updated CORS logic to support domain-based restrictions with dynamic origin validation.
- Improved frontend image hostname resolution using environment-driven URLs.
- Standardized contact email usage across the application.

frontend/next.config.ts

@@ -1,5 +1,16 @@
 import type { NextConfig } from "next";
 
+const appUrl = process.env.NEXT_PUBLIC_APP_URL || "https://memegoat.fr";
+const apiUrl = process.env.NEXT_PUBLIC_API_URL || "https://api.memegoat.fr";
+
+const getHostname = (url: string) => {
+	try {
+		return new URL(url).hostname;
+	} catch {
+		return url;
+	}
+};
+
 const nextConfig: NextConfig = {
 	/* config options here */
 	reactCompiler: true,
@@ -7,11 +18,11 @@ const nextConfig: NextConfig = {
 		remotePatterns: [
 			{
 				protocol: "https",
-				hostname: "memegoat.fr",
+				hostname: getHostname(appUrl),
 			},
 			{
 				protocol: "https",
-				hostname: "api.memegoat.fr",
+				hostname: getHostname(apiUrl),
 			},
 		],
 	},

frontend/src/app/(dashboard)/help/page.tsx

@@ -63,7 +63,9 @@ export default function HelpPage() {
 				<p className="text-muted-foreground">
 					N'hésitez pas à nous contacter sur nos réseaux sociaux ou par email.
 				</p>
-				<p className="font-semibold text-primary">contact@memegoat.fr</p>
+				<p className="font-semibold text-primary">
+					{process.env.NEXT_PUBLIC_CONTACT_EMAIL || "contact@memegoat.fr"}
+				</p>
 			</div>
 		</div>
 	);

frontend/src/app/layout.tsx

@@ -32,7 +32,7 @@ export const metadata: Metadata = {
 	openGraph: {
 		type: "website",
 		locale: "fr_FR",
-		url: "https://memegoat.local",
+		url: "/",
 		siteName: "MemeGoat",
 		title: "MemeGoat | Partagez vos meilleurs mèmes",
 		description: "La plateforme ultime pour les mèmes. Rejoignez le troupeau !",