Wire GPSFix localization and omdev workflow

[jkaflik]

Draft stacked PR. Base: spinoff/webots-gnss-tests.\n\nScope:\n- Route hardware FusionCore through gps_msgs/GPSFix on /gps/fix_extended.\n- Add omdev sync/build/run workflow and hardware target docs.\n- Document hardware datum/map/env flow.\n\nKnown review notes:\n- Hardware GPSFix path still needs direct test coverage.\n- Public defaults should be checked for private host/IP leakage before ready.

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