eb801cd4cf
Add ConnzConnectionInfo, ConnzFilterResult, ConnzFilterOptions, and ConnzFilter static class to Connz.cs, providing a pure unit-testable layer for account-scoped filtering and pagination that mirrors the Go server's /connz ?acc= query-parameter behaviour. Ten new tests in ConnzAccountFilterTests.cs cover FilterByAccount (match, no-match, case-insensitive), ConnzFilterOptions.Parse (acc param, defaults, offset/limit), and ApplyFilters (account filter, offset, limit, no-filter pass-through).