feat: search issues/repos — add --order, --sort, --label flags

[q-soriarty]

Missing flags

search issues (3 high priority)

Flag	Type	Gitea API
--order	string	?order=asc/desc
--sort	string	?sort=created/updated
--label	strings	?labels=

search repos (2 high priority)

Flag	Type	Gitea API
--order	string	?order=
--sort	string	?sort=

Source: flag parity analysis