Build GDPR compliance system: data export, account deletion, consent

- Data export (Art. 15/20): GET /api/gdpr/export serves a full JSON export
  of the user's data (credentials/tokens excluded, exclusions declared)
- Right to erasure (Art. 17): self-service deletion with 30-day grace
  period (Settings -> Privacy & Data), cancellable; daily /api/cron/gdpr
  drain cancels Stripe billing, purges Spaces files, cascade-deletes the
  account, anonymizes consent rows, and writes audit evidence
- Migration 0011: account_deletion_requests (partial unique index = one
  pending per user) + FK-less consent_log (survives erasure)
- Consent: terms/privacy acceptance logged at signup (email + Google);
  cookie banner with analytics opt-out (umami.disabled), choices logged
  server-side for signed-in users via POST /api/gdpr/consent
- Admin deleteUser upgraded to the same full purge (was leaving Spaces
  files and Stripe subscriptions orphaned)
- /gdpr legal page now points at the self-service tools
- scripts/verify-gdpr.ts: end-to-end verification vs live dev DB (22/22)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/(marketing)/gdpr/page.tsx

@@ -134,7 +134,27 @@ export default function GdprPage() {
 
       <Section id="exercise" heading="8. How to exercise your rights">
         <p>
-          To exercise any of the rights described above, contact us at{" "}
+          You can exercise the most common rights yourself, instantly, from{" "}
+          <strong>Settings &rarr; Privacy &amp; Data</strong> in your dashboard:
+        </p>
+        <ul>
+          <li>
+            <strong>Access &amp; portability</strong> &mdash; download a complete,
+            machine-readable JSON export of your personal data and portfolio records.
+          </li>
+          <li>
+            <strong>Erasure</strong> &mdash; delete your account. Deletion is scheduled{" "}
+            {LEGAL.dataDeletionDays} days out (during which you can cancel), after which your
+            account, data, and uploaded files are permanently erased and any active
+            subscription is cancelled.
+          </li>
+          <li>
+            <strong>Rectification</strong> &mdash; correct your details at any time in{" "}
+            <strong>Settings &rarr; Profile</strong>.
+          </li>
+        </ul>
+        <p>
+          For any other request, contact us at{" "}
           <a href={`mailto:${LEGAL.privacyEmail}`}>{LEGAL.privacyEmail}</a>. For
           data-protection matters, you may also contact our data-protection team at{" "}
           <a href={`mailto:${LEGAL.dpoEmail}`}>{LEGAL.dpoEmail}</a>. You also have the right