feat: complete HookLab MVP - TikTok Shop coaching platform

Full-stack Next.js 15 application with:
- Landing page with marketing components (Hero, Testimonials, Pricing, FAQ)
- Multi-step candidature form with API route
- Stripe Checkout integration (subscription + webhooks)
- Supabase Auth (login/register) with middleware protection
- Dashboard with progress tracking and module system
- Formations pages with completion tracking
- Profile management with password change
- Database schema with RLS policies
- Resend email integration for transactional emails

Stack: Next.js 15, TypeScript, Tailwind CSS v4, Supabase, Stripe, Resend

https://claude.ai/code/session_01H2aRGDaKgarPvhay2HxN6Y

app/api/stripe/create-checkout/route.ts

@@ -0,0 +1,65 @@
+import { NextResponse } from "next/server";
+import { stripe } from "@/lib/stripe/client";
+import { getBaseUrl } from "@/lib/utils";
+
+export async function POST(request: Request) {
+  try {
+    const body = await request.json();
+    const { email, candidatureId } = body;
+
+    if (!email) {
+      return NextResponse.json(
+        { error: "Email requis." },
+        { status: 400 }
+      );
+    }
+
+    const baseUrl = getBaseUrl();
+
+    // Créer ou récupérer le customer Stripe
+    const customers = await stripe.customers.list({
+      email,
+      limit: 1,
+    });
+
+    let customerId: string;
+    if (customers.data.length > 0) {
+      customerId = customers.data[0].id;
+    } else {
+      const customer = await stripe.customers.create({
+        email,
+        metadata: { candidature_id: candidatureId || "" },
+      });
+      customerId = customer.id;
+    }
+
+    // Créer la session Checkout
+    const session = await stripe.checkout.sessions.create({
+      customer: customerId,
+      mode: "subscription",
+      payment_method_types: ["card"],
+      line_items: [
+        {
+          price: process.env.STRIPE_PRICE_ID!,
+          quantity: 1,
+        },
+      ],
+      metadata: {
+        candidature_id: candidatureId || "",
+        email,
+      },
+      success_url: `${baseUrl}/merci?session_id={CHECKOUT_SESSION_ID}`,
+      cancel_url: `${baseUrl}/candidature`,
+      allow_promotion_codes: true,
+      billing_address_collection: "required",
+    });
+
+    return NextResponse.json({ url: session.url });
+  } catch (err) {
+    console.error("Erreur creation session Stripe:", err);
+    return NextResponse.json(
+      { error: "Erreur lors de la creation de la session de paiement." },
+      { status: 500 }
+    );
+  }
+}