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>

lib/storage.ts

@@ -319,6 +319,36 @@ export async function deleteFile(key: string, ownerId: string): Promise<void> {
   }
 }
 
+/**
+ * Permanently delete EVERY stored object in a user's namespace (`<userId>/…`),
+ * across whichever backend is active. Used by GDPR account deletion — there is
+ * no undo. Returns the number of objects removed (best effort; local-disk
+ * removals aren't counted individually).
+ */
+export async function deleteUserStorage(userId: string): Promise<number> {
+  const prefix = `${sanitizeSegment(userId)}/`
+
+  if (usingSpaces()) {
+    let deleted = 0
+    let token: string | undefined
+    do {
+      const res = await s3().send(
+        new ListObjectsV2Command({ Bucket: SPACES_BUCKET, Prefix: prefix, ContinuationToken: token })
+      )
+      for (const obj of res.Contents ?? []) {
+        if (!obj.Key) continue
+        await s3().send(new DeleteObjectCommand({ Bucket: SPACES_BUCKET, Key: obj.Key }))
+        deleted++
+      }
+      token = res.IsTruncated ? res.NextContinuationToken : undefined
+    } while (token)
+    return deleted
+  }
+
+  await fs.rm(path.join(STORAGE_DIR, sanitizeSegment(userId)), { recursive: true, force: true })
+  return 0
+}
+
 async function walkDirSize(dir: string): Promise<number> {
   let entries
   try {