refactor(client): delete the UO client half (phase 3, slice 3)

35 files and 5,332 lines out — twelve public pages, seven admin views, two
player views, eight components, the two `data/` leaves and the three `lib/`
ones, plus the two tests that came with them. §2.7.1's estimate of 51 files /
~3,700 lines was measured differently and is corrected in the docs PR.

The seams core keeps, each smaller than what it replaced:

Nine rows leave the public header and six leave the admin sidebar, and both
lists are now free of `feature` gates and of `IconShard`. `moduleTitle` already
handled a module page's heading, so the six TITLES entries and the
`/admin/characters` branch of `sectionTitle` simply go.

`/player` had `PlayerCharacters` as its index — a UO page — and rather than name
a replacement or invent a landing screen it now resolves to the first row of the
portal nav this viewer can reach (`firstDestinationFor`, beside
`allowedPathsFor` and reading the BASE nav for the same reason: an override is
presentation and where everybody lands is behaviour). With the module installed
that is still Characters, so a player's first screen after signing in does not
change. Deliberately generic and deliberately not in the portal layout — the
admin index is the same question with a hardcoded answer, and if the two
logged-in areas ever become one this is what serves both.

`game_account_signup` goes with the rest of core's UO prose: the mode list, the
derived public flag, the validation and a Site Settings field whose help text
named Bridge.cfg. The row itself is untouched and module-uo reads it through
ctx.settings — the data stays, the semantics move.

KNOWN BREAK, accepted by the org lead: the shipped Android app reads
`gameAccountSignup` off `/public/settings` (PublicDto.kt:80). The field has a
`= false` default so nothing crashes; the app silently stops offering
game-account creation until it reads the module's `/public/shard/features`
instead. Out of scope here, recorded in the Android plan, and it lands well
before this workstream's cutover reaches `main`.

620 server + 161 client tests. Manifest 158 public + 2 internal, unchanged;
routes.guards unchanged. The OpenAPI spec loses exactly one property, and only
because it was hand-written in swagger.js — regeneration alone would have left
the spec documenting a field core no longer returns.

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

client/src/routes/admin/views/SettingsAdmin.jsx

@@ -35,18 +35,6 @@ const FIELDS = [
     ],
     fallback: 'disabled',
   },
-  {
-    key: 'game_account_signup',
-    label: 'Game-account creation',
-    help: 'Whether players can create a GAME account (for the game client) from the site. The game server’s own SignupMode (Bridge.cfg) must agree: website/hybrid accept site-created accounts, game refuses them. When enabled, a “Create a game account” form appears in the player portal.',
-    options: [
-      { value: 'disabled', label: 'Disabled — link an existing account only' },
-      { value: 'website', label: 'Website — the site creates game accounts' },
-      { value: 'hybrid', label: 'Hybrid — site or in-game (recommended)' },
-      { value: 'game', label: 'Game only — created in the game client, not the site' },
-    ],
-    fallback: 'disabled',
-  },
 ]
 
 export default function SettingsAdmin() {