feat(device): add clientName to DeviceMeta for multi-client display

Add clientName field to DeviceMeta so non-browser clients (Telegram,
Discord, etc.) can provide a human-readable label instead of relying on
userAgent parsing. Desktop UI now prioritizes clientName over parsed UA
string, fixing "Unknown on Unknown" display for Telegram connections.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/gateway/telegram/telegram.service.ts

@@ -204,7 +204,9 @@ export class TelegramService implements OnModuleInit {
         connectionInfo.token,
         {
           platform: "telegram",
-          userAgent: `Telegram ${telegramUserId} @${msg?.from?.username ?? ""} ${msg?.from?.first_name ?? ""}`.trim(),
+          clientName: msg?.from?.username
+            ? `Telegram @${msg.from.username}`
+            : `Telegram ${msg?.from?.first_name ?? telegramUserId}`,
         }
       );
 

src/hub/device-store.ts

@@ -14,6 +14,7 @@ export interface DeviceMeta {
   userAgent?: string;
   platform?: string;
   language?: string;
+  clientName?: string;
 }
 
 export interface DeviceEntry {