The Floor Map settings only had text fields for the blueprint image path with
no way to upload one. Add a real upload.
- POST /settings/map-blueprint (multipart: file + theme) saves the image to the
instance maps dir and points map_blueprint_<theme> at the served URL;
GET /settings/map-blueprint/<file> serves it (public - kiosks read the map).
- Settings > Floor Map: a file picker + thumbnail next to each theme's field
(still accepts a manual path/URL too).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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