feat(forms): add publish settings command

[bogdanovich]

Summary

• add gog forms publish <formId> for Google Forms publish settings
• support --unpublish and --accepting-responses=false
• return the form responder URI after publishing and include JSON output for scripting
• keep the command disabled in readonly and agent-safe safety profiles
• update generated command docs

Closes #564

Tests

• go test ./internal/cmd -run 'FormsPublish|Forms.*Publish|Execute_Forms'
• go test ./internal/cmd -run 'Safety|Enabled|Schema|Help'
• XDG_CONFIG_HOME=$(mktemp -d) GOG_KEYRING_BACKEND=file go test ./internal/cmd
• make build
• make docs-check