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feat: add WiscNic person and group contact endpoints for subnets
Mirror the existing VLAN contact pattern on subnets: new wn_subnet_person_contacts
and wn_subnet_group_contacts junction tables, models, EF configs, and CRUD
endpoints on SubnetsController. Adds GET /people/{id}/subnets (federated direct
+ via group) and GET /wiscnic/groups/{id}/subnets reverse-lookup endpoints.