HELCOM MPA source profile with EMODnet transform

Source-faithful profile of HELCOM marine protected areas (HELCOM MADS layer 54 'HELCOM MPAs' and layer 190 'Baltic Sea MPA network 2026') as served by the Seadots OGC API - Features collections, with the Python transform that produces the EMODnet-compliant Regional Sea Convention MPA view and routes non-HELCOM codes to the EMODnet layers that already publish them.