Add freemium variant C: archetype persistence, dashboard banner, lesson gate

- User.archetype/utmSource/utmMedium/utmCampaign fields + migration
- register flow reads ?archetype/?utm_* and saves them on the User row
- dashboard ArchetypeBanner: per-archetype 'твой путь' block
- lesson gate after wow-moment lesson (WOW_MOMENT_LESSON_ID=obs-start-l2-006) → tripwire + full-course offer

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/api/register/route.ts

@@ -37,7 +37,7 @@ export async function POST(request: NextRequest) {
     return jsonError("Неверный формат запроса", 400);
   }
 
-  const { name, email, password, website, cfTurnstileResponse } = body;
+  const { name, email, password, website, cfTurnstileResponse, archetype, utmSource, utmMedium, utmCampaign } = body;
 
   // Honeypot — bots fill this field, humans don't see it
   if (website) {
@@ -102,6 +102,19 @@ export async function POST(request: NextRequest) {
           select: { id: true },
         }),
       ]);
+      // Тип второго мозга из квиза + UTM — сохраняем на юзере для персонализации
+      const VALID_ARCHETYPES = ["architect", "gardener", "librarian", "pragmatist"];
+      if (user && (archetype || utmSource || utmMedium || utmCampaign)) {
+        await prisma.user.update({
+          where: { id: user.id },
+          data: {
+            archetype: VALID_ARCHETYPES.includes(String(archetype)) ? String(archetype) : null,
+            utmSource: utmSource ? String(utmSource) : null,
+            utmMedium: utmMedium ? String(utmMedium) : null,
+            utmCampaign: utmCampaign ? String(utmCampaign) : null,
+          },
+        });
+      }
       if (user && course) {
         await prisma.courseEnrollment.upsert({
           where: { userId_courseId: { userId: user.id, courseId: course.id } },