refactor: load settings once per run and reuse shared helpers

The application caches the settings snapshot and reloads it only after
an update through the store, so output and prompt helpers no longer
read and parse config.yml and hosts.yml several times per command.
canPrompt and chooser replace the inline prompt-policy checks.

Checks are tallied by one services.Tally, terminal.Plural replaces the
two app copies, refKind.article/noun replace the comment group's own
words, list commands use servicePage, and web URLs are built by
repositoryURL and webURL in browser.go.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/pull_review.go

@@ -250,12 +250,6 @@ func (a *application) reviewCreateCommand(use, short string) *cobra.Command {
 	return cmd
 }
 
-// canPrompt reports whether tea may ask questions on this terminal.
-func (a *application) canPrompt() bool {
-	s, err := a.deps.Settings.Load()
-	return err == nil && a.policy(s).CanPrompt(a.deps.Streams)
-}
-
 // ownReview refuses to approve or request changes on one's own pull request before any body is
 // written, as Gitea would after.
 func ownReview(pull services.Pull, t target, state string) error {