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/(auth)/register/register-form.tsx

@@ -25,9 +25,13 @@ interface Props {
   privacyPolicyUrl: string;
   termsUrl: string;
   offerUrl: string;
+  archetype?: string;
+  utmSource?: string;
+  utmMedium?: string;
+  utmCampaign?: string;
 }
 
-export function RegisterForm({ showTermsCheckbox, privacyPolicyUrl, termsUrl, offerUrl }: Props) {
+export function RegisterForm({ showTermsCheckbox, privacyPolicyUrl, termsUrl, offerUrl, archetype, utmSource, utmMedium, utmCampaign }: Props) {
   const [name, setName] = useState("");
   const [email, setEmail] = useState("");
   const [password, setPassword] = useState("");
@@ -118,6 +122,10 @@ export function RegisterForm({ showTermsCheckbox, privacyPolicyUrl, termsUrl, of
           password,
           website: honeypot,
           cfTurnstileResponse: turnstileToken,
+          archetype,
+          utmSource,
+          utmMedium,
+          utmCampaign,
         }),
       });
     } catch {