feat(safety): report, block and hide chat lines (MODULE_API 1.21.0)

USER_SAFETY.md step 3, the module half of report, block and hide.

- server/safety.js registers the rust.chat report target (snapshot for one
  reader, null when they could not have seen the line; staff's hide and
  unhide) and the steam game identity (ownersOf from rust_account_links).
- The events feed filters chat per reader, in the query: lines from a
  blocked account's Steam ids, the reader's unlinked Steam-ID blocks and the
  lines they hid. Signed-in readers get canBlock on each chat line (false for
  their own and for staff-linked players). Lines staff hid for everyone are
  left out for everyone but staff, who get them with hidden: true.
- rust_events gains hidden_at and hidden_by (ALTER ... IF NOT EXISTS).
- POST /admin/rust/chat/:id/hide and /unhide (admin, moderator), logged.
- The feed's chat lines get a menu: Report, Hide for me, Block player,
  and for staff Hide for everyone / Show to everyone again.
- coreApi ^1.21.0; ci/core-ref.json pinned to the website#233 merge;
  routes.manifest.json and swagger-fragment.json regenerated.

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

server/router/public/rust.controller.js

@@ -15,6 +15,7 @@ const clans = require('../../model/clans/clans.model')
 const dangerousTreasures = require('../../dangerousTreasures')
 const guardedCrate = require('../../guardedCrate')
 const raidableBases = require('../../raidableBases')
+const safety = require('../../safety')
 const economics = require('../../model/economics/economics.model')
 const events = require('../../model/events/events.model')
 const map = require('../../model/map/map.model')
@@ -90,20 +91,30 @@ async function getServer(req, res) {
  *
  * `staff` is the same re-read rung, and reaches only what a world event carries
  * (protocol 14, D353): a Steam id and a position. It never widens the kinds.
+ *
+ * The chat is read for THIS reader too (USER_SAFETY.md S11): lines whose speaker
+ * they block or that they hid are left out, a line staff hid for everyone is
+ * left out unless they are staff, and a signed-in reader gets `canBlock` on each
+ * line (S13). That is why this route was already `perViewer` and must stay so.
  */
 async function listEvents(req, res) {
   try {
     const presence = await visibility.canSeePresence(req, req.params.id)
+    const reader = { userId: presence.userId, staff: presence.level === 'staff' }
+    // Below the presence audience there is no chat to filter or mark.
+    const chat = presence.visible ? await safety.feedFilter(reader) : {}
+    const rows = await events.recent({
+      serverId: req.params.id,
+      presence: presence.visible,
+      staff: reader.staff,
+      kind: req.query.kind,
+      wipeId: req.query.wipe || null,
+      limit: req.query.limit,
+      chat,
+    })
     perViewer(res)
     res.json({
-      events: await events.recent({
-        serverId: req.params.id,
-        presence: presence.visible,
-        staff: presence.level === 'staff',
-        kind: req.query.kind,
-        wipeId: req.query.wipe || null,
-        limit: req.query.limit,
-      }),
+      events: presence.visible ? await safety.annotate(rows, reader) : rows,
       presenceHidden: !presence.visible,
       presenceAudience: presence.required,
     })