Move the category + tag lists out of the daemon (labels.json + the
get/set_label_taxonomy RPCs) and into the webui's own SQLite DB
(categories, tags tables). The daemon no longer persists webui taxonomy;
per-torrent labels still flow through set_labels for Lua.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The plugin's SQLite store will own more than accounts (taxonomy, RSS),
so give it a general name. Mechanical rename of files + symbols; default
DB filename is now webui.db. No behavior change.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>