feat(rust): Dangerous Treasures — feed, map, Treasure Hunter, Start a Dangerous Treasures event (PLAN_REDESIGNS §14.3.4)

Stage 5 of the §14.3 integration plan, on protocol 14 (docs
rust-link/PROTOCOL.md §20.8).

- dt.started and dt.won are public kinds, dt.ended a staff kind. The new
  dangerousTreasures.js reads each row per viewer: grid and invaderCount for
  everyone, the winner's name for the presence audience (D376), the position,
  the step's key, the winner's Steam id and the invaders for staff.
- Feed lines in the World events filter: "A Dangerous Treasures event has
  started · K12", "Alice won the treasure · K12 · 3 players fought for it".
- Triggers rust.dt.started (with byEvent) and rust.dt.won, public, cooldown
  subject the server, names only.
- eventDangerousTreasures.js: rust.dt.start, "Start a Dangerous Treasures
  event" (risk change, reversible none, budget rust.dt.events), server and
  difficulty. Refused at verify where the server said DT is not loaded or
  console.plugins is false (Rust-Plugins#34). dt-not-ready answers "Dangerous
  Treasures is not ready yet" with retryAfterMs 600000 (D365, D371);
  dt-no-spot retries on core's delay; DT's own refusals are permanent.
- Treasure Hunter (D375): treasuresWon -> treasures_won, the title category
  treasureswon, and a sortable Treasures column shown where the server
  reports DT or a row counts one.
- The map draws a running chest on the world layer; the server settings'
  plugin line names DT and whether a step can start one, from the
  integrations read's new `console`.
- coreApi ^1.15.0, ci/core-ref.json pinned to website main at #215's merge.
  ci/bundle.json ships the two new files; swagger fragment and engagement
  manifest regenerated; README lists DT.

Server 627/627 (16 new in test/dangerousTreasures.test.js) and every check;
client 92/92, build and externals. Booted against the pinned core: 45
triggers, 13 actions, 11 budgets, 21 option sources; 89 routes unchanged.

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

server/router/public/rust.controller.js

@@ -12,6 +12,7 @@
 const core = require('../../core')
 
 const clans = require('../../model/clans/clans.model')
+const dangerousTreasures = require('../../dangerousTreasures')
 const economics = require('../../model/economics/economics.model')
 const events = require('../../model/events/events.model')
 const map = require('../../model/map/map.model')
@@ -119,6 +120,9 @@ async function listLeaderboard(req, res) {
     // reports Economics. `economics` is null otherwise, and the rows carry no
     // `balance`, so a page shows the column exactly when there is one.
     const econ = await economics.forServer(req.params.id)
+    // Treasure Hunter's column (D375): on a server that reports Dangerous
+    // Treasures, and on any page whose rows already count a treasure won.
+    const dt = dangerousTreasures.reportOf(await serversDb.dtReportFor(req.params.id).catch(() => null))
     const withBalance = econ.loaded && wipeId ? { startingBalance: econ.startingBalance } : null
 
     const [rows, held] = await Promise.all([
@@ -140,6 +144,7 @@ async function listLeaderboard(req, res) {
       // past wipe was.
       leaderboard: rows.map((row) => ({ ...row, titles: held.get(row.steamId) || [] })),
       economics: withBalance,
+      dangerousTreasures: Boolean((dt.dangerousTreasures && dt.dangerousTreasures.loaded) || rows.some((r) => r.treasuresWon > 0)),
     })
   } catch (err) {
     log.error('failed to read the leaderboard', { server: req.params.id, error: err.message })