Replace robot_localization with FusionCore

[jkaflik]

Draft spin-off from wip/fusioncore-localization.\n\nScope:\n- Replace robot_localization launch/config with FusionCore.\n- Update Nav2 odom topics and localization docs.\n- Keep the rebased FusionCore gitlink from the source branch.\n\nKnown review notes:\n- Validate the static map -> odom identity strategy before marking ready.\n- GPSFix hardware coverage is intentionally left for a follow-up stack PR.

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