feat(cli): add typed ~/.zot config layer and strict validation
Introduce pkg/cli/client/config.go with ZliConfigFile/ZliConfig and
ReadZliConfigFile, replacing the loose map[string]any load/save path in
config_cmd.go.
Parsing now rejects malformed JSON with ErrCliBadConfig and requires a
non-null configs array (ErrCliMissingConfigsField when wrapped). Each
profile must have non-empty _name and url.
Config commands delegate to typed helpers (Find, AddEntry, RemoveEntry,
GetVar/SetVar/ResetVar, FormatNames, WriteFile). Fresh or minimal files
still behave as empty via isFreshCliRead (ErrEmptyJSON or missing configs).
Tests: prefer t.Setenv("HOME", t.TempDir()) where CLI resolution uses --url
only; align CVE/client/search tests with mandatory profile URL and HOME
isolation.
Signed-off-by: Andrei Aaron <andreifdaaron@gmail.com>
Andrei Aaron