Upgrade the single prompt to multiple named templates (switch/new/save-as/
rename/delete/save, remember last). Decisions: all-custom (seed one 默认),
dirty-check confirm on switch, include rename. Storage: outfit_prompts.json +
outfit_prompt_name in app_config, migrate the old outfit_prompt.txt. Add §7.2
design + §19.8 task (not yet implemented).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>