Move @Singleton command-parameter resolvers out of utils/ into commands/resolvers/

Consistency cleanup following the ChestShop util/service split (PAR-282). utils/resolvers/ held @Singleton framework ParameterResolver<T> implementations (FirmNameResolver, FirmPlayerResolver, OnlineFirmNameResolver) plus their command-parameter value records (FirmName, OnlineFirmName) — DI'd components + command types, not pure utils.

Fix: move the package utils/resolvers/ → commands/resolvers/ (they resolve command parameters). Pure package move + import/FQN updates + redundant-import cleanup; behaviour unchanged.