feat(dashboard): the UGC page replaces UGC Search

The UGC Search page and the UGC page searched the same things (owner,
account, property, the name and description a player gave a model, LOT,
UGC / blueprint id) with the same SQL. The UGC page's lists are now the
one search:

- models' List view has a Where column: placed on a property (with the
  name given there and a link to the model in the property's 3D view),
  in a mail or in the creator's inventories, or not found
  (/api/ugc?where=1, UgcLinks::Whereabouts as before)
- owners link to their character and, with accounts_view, account
- while searching, the kind buttons say how many models and how many
  cars and rockets match (/api/ugc "matches")
- /ugc_search?q= redirects to /ugc?view=list&q=; the menu's UGC Search
  entry is now UGC, which opens the UGC page (it was only under Server
  Admin, for ugc_manage)
- References lose their Find button (Where it is has the same) and name
  the inventory a build is in

The ugc-search page and script are removed; /api/ugc_links/search stays
for API users.

Check: the menu's UGC entry; an old /ugc_search?q= link opens the UGC
list with the search filled in; owner:, account:, property:, name:,
lot: and id: searches, and the counts on the kind buttons; the Where
column's links (property, 3D, character, account).

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

docs/Dashboard.md

@@ -1073,7 +1073,8 @@ are time taken, so less is better.
 The property page's model list shows each model's icon: for a player-built model (or a car or rocket) the icon the UGC
 server made of it (the item's icon until it has), with its UGC state and a link to it on the UGC page. The character
 page's inventories (models, vault models and the brick building ones included) show creations the same way.
-**UGC Search** (`/ugc_search`, `properties_view`) finds creations and where they are: see docs/UgcServer.md.
+The **UGC** page (`/ugc`, `properties_view`) finds creations by owner, account, property, name, LOT or id and says where they are (it
+replaced the UGC Search page): see docs/UgcServer.md.
 
 **Today's Top Properties** (Properties page, permission `feature_properties`, default GM 5). The game's news screen has
 four "Today's Top Properties" slots, one per small property world: Block Yard, Nimbus Rock, Chantey Shanty and Raven