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 A withdrawn style is one `chat-group` retirement, never for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

client/src/api.js

@@ -132,6 +132,11 @@ export const admin = {
   // picture to draw one — which stalls that game for seconds (D109).
   fetchMap: (id) => req(`/admin/rust/servers/${encodeURIComponent(id)}/map/fetch`, { method: 'POST' }),
   renderMap: (id) => req(`/admin/rust/servers/${encodeURIComponent(id)}/map/render`, { method: 'POST' }),
+  // Phase 17: a server's chat titles, what optional mods it has, and the voice.
+  saveTitles: (id, body) => req(`/admin/rust/servers/${encodeURIComponent(id)}/titles`, { method: 'PUT', body }),
+  integrations: (id) => req(`/admin/rust/servers/${encodeURIComponent(id)}/integrations`),
+  voice: () => req('/admin/rust/voice'),
+  saveVoice: (group) => req('/admin/rust/voice', { method: 'PUT', body: { group } }),
 }
 
 // ── admin · permissions (R2) ──────────────────────────────────────────────