Categories from the inner name, spots and groups; fix the name rules

Migration 1200 passed regexes with `?` through knex, which made them
bindings: the live function held blu-$1ray, web-$2dl and h\.$326[45], so
BluRay, WEB-DL and H.264 names without a resolution were Misc. 93% of
recent releases were Misc, as the category came from the name alone.

category becomes a plain column (DROP EXPRESSION, no rewrite) set by a
trigger: the name's category (fixed, no `?` anywhere; adds XXX,
audiobooks, console and PC games, and TV codes like S01e07[ and
S04E01E02), else the prober's inner name's, else one given before (a
spot's), else the groups'. The spot inspector sets a spot's category
(spot_category) on Misc releases it links and on its own releases. The
Newznab and web category lists gain Console, PC Games, Audiobook, Anime,
XXX and Comics. releases:recategorize recomputes existing rows in id
batches, writing only changed rows and waiting under a free-space floor.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

REBUILD.md

@@ -198,8 +198,13 @@ dropping garbage; 28 TB of compressed overview traffic. Throughput goal:
    again after a par2 merge and before the pruner drops a set's file list.
    Segments aren't compared. Phase 2 picks its work from settled releases.
 
-9. **NZB and API**. NZB built from a release's chunks; a minimal Newznab
-   search (names) and get. Web UI later.
+9. **NZB and API**. NZB built from a release's chunks, with a known
+   password in its meta; Newznab search (names, inner names) and get; a web
+   interface. Categories (Newznab's) by a trigger on releases (migration
+   5200): from the name, else the inner name the prober found, else a spot's
+   category (spot_category, set by the spot inspector), else the groups
+   (erotica, sounds, ebooks, …). `releases:recategorize` recomputes old rows
+   in batches.
 
 ## Group list