fix(admin): no decision numbers in admin copy, and "1 player holds one"

Twenty-four strings an administrator reads carried an internal decision
number - "(D189)", "(D198)", "(D257, D270)" and the like: the permission
screen's group Servers tab and a chip tooltip, the event editor's step
field and budget descriptions, two option sources, a command reward's
skipped note, and five NPC profile validation errors. A D-number means
something to the plan, never to an operator. Each is removed, and the
sentence around it left as it was. The developer-facing swagger
descriptions and code comments keep theirs.

The servers page's chat-title line read "Last pushed: 1 player hold
one." It now says "holds" for one.

Two tests pinned the old wording and now assert the text instead.

Found while writing the runicgateway.com Rust docs (its PLAN.md §16,
phase 15).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/model/npcs/npcs.model.js

@@ -272,7 +272,7 @@ async function create(input, userId = null) {
 async function update(id, input) {
   const existing = await db.getProfile(id)
   if (!existing) throw new NpcError('no such profile', 404)
-  if (existing.replaced) throw new NpcError('this profile is kept aside as replaced (D251): restore it before editing it', 409)
+  if (existing.replaced) throw new NpcError('this profile is kept aside as replaced: restore it before editing it', 409)
   const clean = await validate(input, existing.id)
   await db.saveProfile({ ...clean, id: existing.id })
   const before = reach(existing)