feat(rust): RunicNPC is required for every Place NPCs step (runicnpc stage 9, D310)

A Place NPCs step on a server without RunicNPC, or with one older than the
bridge needs, is refused before it is sent: "<server> needs RunicNPC to place
NPCs, Rust's own scientists included: <why>". Rust's own scientists were the
fallback until now (D243); they need RunicNPC too. Crates are unaffected.

- npcs.model: API_NEEDED rises from 4 to 6, the bridge's RunicNpcApiNeeded, so a
  server the site calls ready is one the bridge will not refuse as runicnpc-old.
  The profile push follows the same floor.
- eventWorld: profileMissing becomes npcMissing, asked for every NPC step.
- Admin → Rust → Servers: each server carries `runicNpc` ({ready, absence,
  version, api}) and a server without one that will do reads "Incomplete" with
  the reason. Swagger documents the field.

The event picker is unchanged in this commit (an open question on the PR).

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

client/src/routes/admin/ServerSettings.jsx

@@ -61,6 +61,15 @@ const ZONES = (() => {
 })()
 
 /** An ISO instant as the value a `datetime-local` input takes, in the browser's clock. */
+/**
+ * Why the server's RunicNPC will not do (runicnpc stage 9, D310), or null when it
+ * does. RunicNPC is required, so a server without it is shown as incomplete.
+ */
+export function runicNpcNote(npc) {
+  if (!npc || npc.ready) return null
+  return `Incomplete: ${npc.absence || 'RunicNPC is not loaded on it'}. RunicNPC is required — without it every Place NPCs step is refused, Rust’s own scientists included. Runic Gateway’s installer and egg put it in place.`
+}
+
 /**
  * What the missing ZoneManager helper costs this server (PLAN_FIXES F12, D182), or
  * null when there is nothing to say — the helper patched, or a plugin that
@@ -252,6 +261,9 @@ export default function ServerSettings() {
                 : 'No wipe schedule set.'}
             </div>
             <div className="dim" style={{ fontSize: '0.76rem', marginTop: 2 }}>{titlesSummary(s.titles, s.titlePush, categories)}</div>
+            {runicNpcNote(s.runicNpc) && (
+              <div style={{ fontSize: '0.76rem', marginTop: 2, color: 'var(--warn, #d9c184)' }}>{runicNpcNote(s.runicNpc)}</div>
+            )}
             {zoneHelperNote(s.zoneHelper) && (
               <div style={{ fontSize: '0.76rem', marginTop: 2, color: 'var(--warn, #d9c184)' }}>{zoneHelperNote(s.zoneHelper)}</div>
             )}