Add channel health diagnostics and gateway recovery fixes (#855)

electron/api/server.ts

@@ -15,6 +15,7 @@ import { handleSkillRoutes } from './routes/skills';
 import { handleFileRoutes } from './routes/files';
 import { handleSessionRoutes } from './routes/sessions';
 import { handleCronRoutes } from './routes/cron';
+import { handleDiagnosticsRoutes } from './routes/diagnostics';
 import { sendJson, setCorsHeaders, requireJsonContentType } from './route-utils';
 
 type RouteHandler = (
@@ -35,6 +36,7 @@ const routeHandlers: RouteHandler[] = [
   handleFileRoutes,
   handleSessionRoutes,
   handleCronRoutes,
+  handleDiagnosticsRoutes,
   handleLogRoutes,
   handleUsageRoutes,
 ];