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

server/router/admin/rust.controller.js

@@ -27,10 +27,11 @@ const log = core.logger('admin')
 
 async function listServers(req, res) {
   try {
-    const [rows, settings, categories] = await Promise.all([
+    const [rows, settings, categories, npcStatus] = await Promise.all([
       servers.listForAdmin(),
       titlesModel.settingsByServer(),
       titlesModel.categories(),
+      npcs.serverStatus(),
     ])
 
     // Phase 17: each server's chat titles, and what the last push of them found.
@@ -41,6 +42,8 @@ async function listServers(req, res) {
         ...row,
         titles: settings.get(row.id) || { mode: 'first', max: 2, rules: [] },
         titlePush: titleSync.lastPush(row.id),
+        // Runicnpc stage 9 (D310): RunicNPC is required, so a server without it is incomplete.
+        runicNpc: npcStatus.get(row.id) || { ready: false, absence: 'no such server', version: null, api: 0 },
       })),
       titleCategories: categories,
     })