Branche le formulaire de contact sur Resend

- Envoi reel via le SDK Resend dans app/actions/contact.ts (avec gestion d'erreur)
- Cles/adresses lues depuis l'env (RESEND_API_KEY, CONTACT_TO_EMAIL, CONTACT_FROM_EMAIL)
- Ajout de resend en dependance + lock synchronise
- .env.example documente la config (autorise dans .gitignore)
- README + TODO a jour

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/actions/contact.ts

@@ -1,5 +1,7 @@
 "use server";
 
+import { Resend } from "resend";
+
 export type ContactState = {
   status: "idle" | "success" | "error";
   message: string;
@@ -38,9 +40,44 @@ export async function sendContact(
     };
   }
 
-  // TODO: wire to Resend / Postmark / SendGrid to actually deliver the email.
-  // For now we log so messages are visible in server logs.
-  console.log("[contact]", { name, email, subject, message });
+  const apiKey = process.env.RESEND_API_KEY;
+  const to = process.env.CONTACT_TO_EMAIL;
+  const from = process.env.CONTACT_FROM_EMAIL;
+
+  if (!apiKey || !to || !from) {
+    console.error(
+      "[contact] Missing email env vars (RESEND_API_KEY / CONTACT_TO_EMAIL / CONTACT_FROM_EMAIL).",
+    );
+    return {
+      status: "error",
+      message: "Email isn't configured yet. Please try again later.",
+    };
+  }
+
+  try {
+    const resend = new Resend(apiKey);
+    const { error } = await resend.emails.send({
+      from,
+      to,
+      replyTo: email,
+      subject: `[Contact] ${subject}`,
+      text: `From: ${name} <${email}>\n\n${message}`,
+    });
+
+    if (error) {
+      console.error("[contact] Resend error:", error);
+      return {
+        status: "error",
+        message: "Something went wrong sending your message. Please try again.",
+      };
+    }
+  } catch (err) {
+    console.error("[contact] Unexpected error:", err);
+    return {
+      status: "error",
+      message: "Something went wrong sending your message. Please try again.",
+    };
+  }
 
   return {
     status: "success",