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/federation.js

@@ -2,6 +2,7 @@ import crypto from 'crypto';
 import fs from 'fs';
 import path from 'path';
 import { fileURLToPath } from 'url';
+import { log } from './logger.js';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -19,14 +20,14 @@ if (FEDERATION_DOMAIN) {
     }
 
     if (!privateKeyPem) {
-        console.log('Generating new Ed25519 federation key pair...');
+        log.federation.info('Generating new Ed25519 key pair...');
         const { privateKey, publicKey } = crypto.generateKeyPairSync('ed25519', {
             publicKeyEncoding: { type: 'spki', format: 'pem' },
             privateKeyEncoding: { type: 'pkcs8', format: 'pem' },
         });
         privateKeyPem = privateKey;
         fs.writeFileSync(keyPath, privateKeyPem, 'utf8');
-        console.log(`Saved new federation private key to ${keyPath}`);
+        log.federation.info(`Saved new private key to ${keyPath}`);
     }
 
     // Derive public key from the loaded private key
@@ -83,7 +84,7 @@ export function verifyPayload(payload, signature, remotePublicKeyPem) {
         const data = Buffer.from(JSON.stringify(payload));
         return crypto.verify(null, data, remotePublicKeyPem, Buffer.from(signature, 'base64'));
     } catch (e) {
-        console.error('Signature verification error:', e.message);
+        log.federation.error(`Signature verification error: ${e.message}`);
         return false;
     }
 }
@@ -131,7 +132,7 @@ export async function discoverInstance(domain) {
         discoveryCache.set(domain, result);
         return result;
     } catch (error) {
-        console.error(`Federation discovery failed for ${domain}:`, error.message);
+        log.federation.error(`Discovery failed for ${domain}: ${error.message}`);
         throw new Error(`Could not discover Redlight instance at ${domain}: ${error.message}`);
     }
 }