fix(percy): rewrite clone-build with correct API format and auto-routing

- Auto-install Percy CLI if missing, use URL Replay for URL-named snapshots
- Screenshot copy: add type fields, strict base64, proper tag/tile format
- Copy real device/browser names from source (not hardcoded "Clone/Screenshot")
- Use existing target project instead of forcing new app-type project
- Only create companion app-type project when web project + screenshot copy

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: DeRaowl