feat(38-01): wire telegramService + telegramRoutes into app.ts

- Import telegramService, telegramRoutes, nexusSettingsService
- Mount /telegram routes under /api prefix
- Conditionally start Telegram bot on boot if telegramToken is configured
- Token route restarts bot after saving new token

server/src/app.ts

@@ -33,6 +33,9 @@ import { assistantHandoffRoutes } from "./routes/assistant-handoff.js";
 import { chatFileRoutes } from "./routes/chat-files.js";
 import { nexusSettingsRoutes } from "./routes/nexus-settings.js";
 import { voiceRoutes } from "./routes/voice.js";
+import { telegramService } from "./services/telegram.js";
+import { telegramRoutes } from "./routes/telegram.js";
+import { nexusSettingsService } from "./services/nexus-settings.js";
 import { pluginRoutes } from "./routes/plugins.js";
 import { pluginUiStaticRoutes } from "./routes/plugin-ui-static.js";
 import { applyUiBranding } from "./ui-branding.js";
@@ -183,6 +186,11 @@ export async function createApp(
   api.use(chatFileRoutes(db, opts.storageService));
   api.use(nexusSettingsRoutes());
   api.use(voiceRoutes());
+
+  // Telegram bridge — create service instance and mount routes
+  const tg = telegramService(db);
+  api.use(telegramRoutes(db, tg));
+
   const hostServicesDisposers = new Map<string, () => void>();
   const workerManager = createPluginWorkerManager();
   const pluginRegistry = pluginRegistryService(db);
@@ -358,5 +366,15 @@ export async function createApp(
     void flushPluginLogBuffer();
   });
 
+  // Conditionally start telegram bot if token is configured
+  {
+    const settings = await nexusSettingsService().get();
+    if (settings.telegramToken) {
+      tg.start(settings.telegramToken).catch((err) => {
+        logger.error({ err }, "Failed to start Telegram bot");
+      });
+    }
+  }
+
   return app;
 }