feat(rust): chat titles, BetterChat group styles, the voice and popups (phase 17)

PLAN.md §33, D134-D143. Protocol 12.

- Chat titles (D135-D137): per-server rules (stat, top N, text, colour)
  that rank the current wipe, and a mode (first | all | up to N). Worked
  out once in model/titles and read three ways: pushed whole to the game by
  a new titleSync loop (on change, restart or wipe), and on every
  leaderboard row as `titles`. Admin: PUT /servers/:id/titles.
- Group styles (D138, D139): a site group may carry all twelve BetterChat
  fields (rust_perm_group_chat). They ride perm.sync with `expect` from the
  pushed ledger, which gains a value column; a field changed in game is a
  `chat-field` drift row with the game's value, adopted into the style or
  put back. A withdrawn style is one `chat-group` retirement, never for
  `default`, cleared from the ledger only once BetterChat removed it.
- The voice (D140): one fleet setting naming a styled group; news and
  rust.announce chat lines carry its format and the plugin says them with
  no sender. Admin: GET/PUT /voice.
- Popups (D141, D142): rust.announce gains `delivery` (still version 1,
  from rust.options.delivery); each server gains news_delivery beside the
  news switch; `popup-unavailable` is not retried.
- GET /servers/:id/integrations reads, live, which optional mods a server
  has loaded. README lists BetterChat and PopupNotifications as optional.

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

server/boot.js

@@ -49,6 +49,7 @@ const eventWorld = require('./eventWorld')
 const ingest = require('./ingest')
 const mapImages = require('./mapImages')
 const permSync = require('./permSync')
+const titleSync = require('./titleSync')
 const servers = require('./model/servers/servers.model')
 const sidecar = require('./sidecarClient')
 
@@ -261,6 +262,8 @@ async function onBoot() {
   // to every configured game server before the website had finished booting, and
   // nothing about R2 is urgent enough to delay a listener for.
   permSync.start()
+  // The chat titles have a loop of their own for the same reason (phase 17).
+  titleSync.start()
   refreshTimer = setInterval(refresh, REFRESH_MS)
   ingestTimer = setInterval(ingestAll, INGEST_MS)
   pruneTimer = setInterval(prune, PRUNE_MS)
@@ -285,6 +288,7 @@ async function onBoot() {
  */
 async function onShutdown() {
   permSync.stop()
+  titleSync.stop()
 
   for (const timer of [refreshTimer, ingestTimer, pruneTimer, sweepTimer]) {
     if (timer) clearInterval(timer)