feat(logging): implement centralized logging system and replace console errors with structured logs

feat(federation): add room sync and deletion notification endpoints for federated instances

fix(federation): handle room deletion and update settings during sync process

feat(federation): enhance FederatedRoomCard and FederatedRoomDetail components to display deleted rooms

i18n: add translations for room deletion messages in English and German

server/jobs/federationSync.js

@@ -0,0 +1,154 @@
+import { getDb } from '../config/database.js';
+import { log, fmtDuration } from '../config/logger.js';
+import {
+  isFederationEnabled,
+  getFederationDomain,
+  signPayload,
+  discoverInstance,
+  parseAddress,
+} from '../config/federation.js';
+
+const SYNC_INTERVAL_MS = 60_000; // 1 minute
+
+let syncTimer = null;
+
+/**
+ * Periodic federation sync job.
+ * Groups federated rooms by origin domain, then batch-queries each origin
+ * for current room settings. Updates local records if settings changed or
+ * if the room was deleted on the origin.
+ */
+async function runSync() {
+  if (!isFederationEnabled()) return;
+
+  const syncStart = Date.now();
+  let totalUpdated = 0;
+  let totalDeleted = 0;
+  let totalRooms = 0;
+
+  try {
+    const db = getDb();
+
+    // Fetch all non-deleted federated rooms
+    const rooms = await db.all(
+      'SELECT id, meet_id, from_user, room_name, max_participants, allow_recording FROM federated_rooms WHERE deleted = 0'
+    );
+
+    if (rooms.length === 0) return;
+    totalRooms = rooms.length;
+
+    // Group by origin domain
+    const byDomain = new Map();
+    for (const room of rooms) {
+      if (!room.meet_id) continue; // no room UID, can't sync
+      const { domain } = parseAddress(room.from_user);
+      if (!domain) continue;
+      if (!byDomain.has(domain)) byDomain.set(domain, []);
+      byDomain.get(domain).push(room);
+    }
+
+    // Query each origin domain
+    for (const [domain, domainRooms] of byDomain) {
+      try {
+        const roomUids = [...new Set(domainRooms.map(r => r.meet_id))];
+
+        const payload = {
+          room_uids: roomUids,
+          timestamp: new Date().toISOString(),
+        };
+        const signature = signPayload(payload);
+        const { baseUrl: remoteApi } = await discoverInstance(domain);
+
+        const response = await fetch(`${remoteApi}/room-sync`, {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+            'X-Federation-Signature': signature,
+            'X-Federation-Origin': getFederationDomain(),
+          },
+          body: JSON.stringify(payload),
+          signal: AbortSignal.timeout(15_000),
+        });
+
+        if (!response.ok) {
+          log.fedSync.warn(`${domain} responded with status ${response.status}`);
+          continue;
+        }
+
+        const data = await response.json();
+        const remoteRooms = data.rooms || {};
+
+        // Update local records
+        for (const localRoom of domainRooms) {
+          const remote = remoteRooms[localRoom.meet_id];
+          if (!remote) continue; // UID not in response, skip
+
+          if (remote.deleted) {
+            // Room was deleted on origin
+            await db.run(
+              'UPDATE federated_rooms SET deleted = 1, updated_at = CURRENT_TIMESTAMP WHERE id = ?',
+              [localRoom.id]
+            );
+            totalDeleted++;
+            log.fedSync.info(`Room ${localRoom.meet_id} deleted on origin ${domain}`);
+          } else {
+            // Check if settings changed
+            const changed =
+              localRoom.room_name !== remote.room_name ||
+              (localRoom.max_participants ?? 0) !== (remote.max_participants ?? 0) ||
+              (localRoom.allow_recording ?? 1) !== (remote.allow_recording ?? 1);
+
+            if (changed) {
+              await db.run(
+                `UPDATE federated_rooms
+                 SET room_name = ?, max_participants = ?, allow_recording = ?, updated_at = CURRENT_TIMESTAMP
+                 WHERE id = ?`,
+                [remote.room_name, remote.max_participants ?? 0, remote.allow_recording ?? 1, localRoom.id]
+              );
+              totalUpdated++;
+              log.fedSync.info(`Room ${localRoom.meet_id} settings updated from ${domain}`);
+            }
+          }
+        }
+      } catch (err) {
+        log.fedSync.warn(`Sync with ${domain} failed: ${err.message}`);
+      }
+    }
+
+    // Summary log (only if something happened)
+    if (totalUpdated > 0 || totalDeleted > 0) {
+      log.fedSync.info(
+        `Sync complete: ${totalRooms} rooms, ${totalUpdated} updated, ${totalDeleted} deleted (${fmtDuration(Date.now() - syncStart)})`
+      );
+    }
+  } catch (err) {
+    log.fedSync.error(`Sync job failed: ${err.message}`);
+  }
+}
+
+/**
+ * Start the periodic federation sync job.
+ */
+export function startFederationSync() {
+  if (!isFederationEnabled()) {
+    log.fedSync.info('Disabled (federation not configured)');
+    return;
+  }
+
+  // Run first sync after a short delay to let the server fully start
+  setTimeout(() => {
+    runSync();
+    syncTimer = setInterval(runSync, SYNC_INTERVAL_MS);
+    log.fedSync.info('Started (interval: 60s)');
+  }, 5_000);
+}
+
+/**
+ * Stop the periodic federation sync job.
+ */
+export function stopFederationSync() {
+  if (syncTimer) {
+    clearInterval(syncTimer);
+    syncTimer = null;
+  }
+}