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/model/npcs/npcs.model.js

@@ -18,8 +18,13 @@ const serversDb = require('../servers/servers.db')
 const db = require('./npcs.db')
 const shape = require('./npcProfile')
 
-/** The RunicNPC API the bridge's `npc.*` commands need: 3 for placements (D249), 4 for the faction table and an event's orders (stage 5). */
-const API_NEEDED = 4
+/**
+ * The RunicNPC API the bridge needs (its `RunicNpcApiNeeded`): 3 for placements
+ * (D249), 4 the faction table and an event's orders (stage 5), 5 bosses (stage 6),
+ * 6 loot (stage 7). Stage 9 (D310) makes the site's floor the bridge's, so a
+ * server the site calls ready is one the bridge will not refuse as `runicnpc-old`.
+ */
+const API_NEEDED = 6
 
 class NpcError extends Error {
   constructor(message, status = 400) {
@@ -51,6 +56,24 @@ function npcAbsence(server) {
   return null
 }
 
+/**
+ * Each server's RunicNPC as Admin → Rust shows it (stage 9, D310): a server
+ * without one that will do is incomplete, because events cannot place NPCs there.
+ */
+async function serverStatus() {
+  const out = new Map()
+  for (const s of await db.listNpcServers()) {
+    const ready = npcReady(s)
+    out.set(s.id, {
+      ready,
+      ...(ready ? {} : { absence: npcAbsence(s) }),
+      version: (s.runicNpc && s.runicNpc.version) || null,
+      api: (s.runicNpc && s.runicNpc.api) || 0,
+    })
+  }
+  return out
+}
+
 // ── What a server is sent ───────────────────────────────────────────────────
 
 /**
@@ -514,6 +537,7 @@ module.exports = {
   covers,
   npcReady,
   npcAbsence,
+  serverStatus,
   desiredFor,
   adopt,
   describe,