Houmgaor 5fe1b22550 feat(save-transfer): add saveutil CLI and token-gated import endpoint ...

Adds two complementary paths for transferring character save data between
Erupe instances without breaking the SHA-256 integrity check system:

- `cmd/saveutil/`: admin CLI with `import`, `export`, `grant-import`, and
  `revoke-import` subcommands. Direct DB access; no server running required.
- `POST /v2/characters/{id}/import`: player-facing API endpoint gated behind
  a one-time token issued by `saveutil grant-import` (default TTL 24 h).
  Token is validated and consumed atomically to prevent TOCTOU races.
- Migration `0013_save_transfer`: `savedata_import_token` and
  `savedata_import_token_expiry` columns on `characters` table.
- Both paths decompress incoming savedata and recompute the SHA-256 hash
  server-side, so the integrity check remains valid after import.
- README documents both methods and the per-character hash-reset workaround.

Closes #183.

2026-03-21 20:14:58 +01:00

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feat(save-transfer): add saveutil CLI and token-gated import endpoint

2026-03-21 20:14:58 +01:00