justin e9b2436ce0 Account export / restore-into-new-tree / delete ...

New account_service + endpoints under /users/me:
- GET /me/export — zip of every owned tree (account.json + media blobs).
- POST /me/import — restore a backup into NEW trees (ids remapped, media
  re-uploaded); non-destructive, never touches existing data.
- DELETE /me — soft-delete the user, their owned trees, and revoke sessions;
  guarded by retyping the account email.

Settings page wires all three (export download, restore upload, delete with
typed-email confirmation). No migration — uses existing tables + soft-delete.

52 backend tests pass (export→restore round-trip + delete guards); frontend builds.

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

2026-06-07 11:26:04 -04:00

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