v1.0.3

Highlights\n- Fix attachment-only Hearth inbound messages, so sending attachments without text no longer fails with Missing required fields.\n- Move Hearth model preset settings to ~/.openclaw/hearth.json as the single source of truth.\n- Remove the old model preset DB dependency and related drift issues.\n\n## Included commits\n- 9717168 fix: allow attachment-only hearth inbound messages\n- a2bbc2c cleanup: remove model preset db dependency\n- 35103d0 refactor: use hearth json for model preset settings\n- cd06292 fix: use latest model preset settings row