cmdio: drop unused PromptOptions.AllowEdit

[pietern]

Summary

AllowEdit only affects how promptui renders a non-empty Default: with AllowEdit:true the default pre-fills the buffer; with AllowEdit:false it appears as a placeholder that's wiped on first keystroke. No caller in the repo sets Default, so the field has been a no-op everywhere it was passed. Drop it rather than carry an option that does nothing.

Test plan

• go build ./...
• go vet ./cmd/configure/... ./cmd/auth/... ./libs/cmdio/...
• go test ./libs/cmdio/... ./cmd/configure/... ./cmd/auth/...

This pull request and its description were written by Isaac.

[github-actions]

Approval status: pending

/cmd/auth/ - needs approval

Files: cmd/auth/auth.go, cmd/auth/login.go
Suggested: @simonfaltum
Also eligible: @tanmay-db, @tejaskochar-db, @hectorcast-db, @mihaimitrea-db, @renaudhartert-db, @parthban-db, @Divyansh-db, @chrisst, @rauchy

/cmd/configure/ - needs approval

Files: cmd/configure/configure.go
Suggested: @simonfaltum
Also eligible: @tanmay-db, @tejaskochar-db, @hectorcast-db, @mihaimitrea-db, @renaudhartert-db, @parthban-db, @Divyansh-db, @chrisst, @rauchy

/libs/cmdio/ - needs approval

Files: libs/cmdio/prompt.go
Suggested: @simonfaltum
Also eligible: @tanmay-db, @tejaskochar-db, @hectorcast-db, @mihaimitrea-db, @renaudhartert-db, @parthban-db, @Divyansh-db, @chrisst, @rauchy

_{Any maintainer (@andrewnester, @anton-107, @denik, @shreyas-goenka, @simonfaltum, @renaudhartert-db) can approve all areas.
See OWNERS for ownership rules.}

[github-actions]

Approval status: pending

/cmd/auth/ - needs approval

Files: cmd/auth/auth.go, cmd/auth/login.go
Suggested: @simonfaltum
Also eligible: @tanmay-db, @tejaskochar-db, @hectorcast-db, @mihaimitrea-db, @renaudhartert-db, @parthban-db, @Divyansh-db, @chrisst, @rauchy

/cmd/configure/ - needs approval

Files: cmd/configure/configure.go
Suggested: @simonfaltum
Also eligible: @tanmay-db, @tejaskochar-db, @hectorcast-db, @mihaimitrea-db, @renaudhartert-db, @parthban-db, @Divyansh-db, @chrisst, @rauchy

/libs/cmdio/ - needs approval

Files: libs/cmdio/prompt.go
Suggested: @simonfaltum
Also eligible: @tanmay-db, @tejaskochar-db, @hectorcast-db, @mihaimitrea-db, @renaudhartert-db, @parthban-db, @Divyansh-db, @chrisst, @rauchy

_{Any maintainer (@andrewnester, @anton-107, @denik, @shreyas-goenka, @simonfaltum, @renaudhartert-db) can approve all areas.
See OWNERS for ownership rules.}