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/config/redis.js

@@ -1,4 +1,5 @@
 import Redis from 'ioredis';
+import { log } from './logger.js';
 
 const REDIS_URL = process.env.REDIS_URL || 'redis://localhost:6379';
 
@@ -13,12 +14,12 @@ const redis = new Redis(REDIS_URL, {
 redis.on('error', (err) => {
   // Suppress ECONNREFUSED noise after initial failure — only warn
   if (err.code !== 'ECONNREFUSED') {
-    console.warn('⚠️  DragonflyDB error:', err.message);
+    log.redis.warn(`DragonflyDB error: ${err.message}`);
   }
 });
 
 redis.on('connect', () => {
-  console.log('🐉 DragonflyDB connected');
+  log.redis.info('DragonflyDB connected');
 });
 
 export default redis;