packages/dashboard/                    # Backend
├── src/services/                      # Business logic
│   └── <feature>Service.ts           # Service with singleton pattern
└── src/server/routes/
    ├── <feature>.routes.ts           # Express routes
    └── index.ts                       # Route exports

packages/dashboard-frontend/           # Frontend
├── src/api.ts                         # API types and functions
├── src/routes.ts                      # Route definitions
├── src/App.tsx                        # Main app with routing
└── src/components/
    ├── Layout/Sidebar.tsx             # Navigation
    └── <FeatureName>Tab.tsx          # Tab component
        └── <FeatureName>/            # Sub-components

// packages/dashboard/src/services/featureService.ts
import { createServiceLogger } from '@orientbot/core';

const logger = createServiceLogger('feature-service');

export class FeatureService {
  constructor(private db: MessageDatabase) {}

  async getData(): Promise<FeatureData> {
    // Implementation
  }
}

let instance: FeatureService | null = null;

export function initFeatureService(db: MessageDatabase): FeatureService {
  instance = new FeatureService(db);
  return instance;
}

export function getFeatureService(): FeatureService {
  if (!instance) throw new Error('Service not initialized');
  return instance;
}

// packages/dashboard/src/server/routes/feature.routes.ts
import { Router, Request, Response } from 'express';
import { createServiceLogger } from '@orientbot/core';
import { getFeatureService } from '../../services/featureService.js';

const logger = createServiceLogger('feature-routes');

export function createFeatureRoutes(
  requireAuth: (req: Request, res: Response, next: () => void) => void
): Router {
  const router = Router();

  router.get('/data', requireAuth, async (_req: Request, res: Response) => {
    try {
      const service = getFeatureService();
      const data = await service.getData();
      res.json(data);
    } catch (error) {
      logger.error('Failed to get data', { error: String(error) });
      res.status(500).json({ error: 'Failed to get data' });
    }
  });

  return router;
}

// In routes/index.ts - add export
export { createFeatureRoutes } from './feature.routes.js';

// In routes.ts - import and register
import { createFeatureRoutes } from './routes/index.js';
import { initFeatureService } from '../services/featureService.js';

// In setupApiRoutes function:
initFeatureService(db);
router.use('/feature', createFeatureRoutes(requireAuth));

// In packages/dashboard-frontend/src/api.ts

export interface FeatureData {
  items: FeatureItem[];
  total: number;
}

export async function getFeatureData(): Promise<FeatureData> {
  return apiRequest('/feature/data');
}

export async function updateFeature(id: string, data: Partial<FeatureItem>): Promise<FeatureItem> {
  return apiRequest(`/feature/${id}`, {
    method: 'PUT',
    body: JSON.stringify(data),
  });
}

// In packages/dashboard-frontend/src/routes.ts

// 1. Add to GlobalView union type
export type GlobalView =
  | 'billing'
  | 'monitoring'
  | 'feature'  // Add here
  | 'settings';

// 2. Add to ROUTES constant
export const ROUTES = {
  BILLING: '/billing',
  MONITORING: '/monitoring',
  FEATURE: '/feature',  // Add here
  SETTINGS: '/settings',
} as const;

// 3. Add to getRouteState function
if (pathname.startsWith('/feature')) {
  return { ...defaultState, globalView: 'feature' };
}

// 4. Add to getRoutePath function
case 'feature':
  return ROUTES.FEATURE;

// In Sidebar.tsx - add to GlobalView type and navigation links

// Add icon + link after existing items:
<Link
  to={ROUTES.FEATURE}
  className={`w-full flex items-center gap-2 px-3 py-2 text-sm font-medium rounded-md transition-colors ${
    isGlobalActive('feature')
      ? 'bg-primary text-primary-foreground'
      : 'text-muted-foreground hover:bg-accent hover:text-accent-foreground'
  }`}
>
  <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
    {/* Icon path */}
  </svg>
  Feature Name
</Link>

// Import component
import FeatureTab from './components/FeatureTab';

// Add rendering
{globalView === 'feature' && <FeatureTab />}

// Add command palette entry
cmds.push({
  id: 'nav-feature',
  label: 'Feature Name',
  description: 'Feature description',
  category: 'navigation',
  keywords: ['keyword1', 'keyword2'],
  icon: (<svg>...</svg>),
  action: () => navigate(ROUTES.FEATURE),
});

// packages/dashboard-frontend/src/components/FeatureTab.tsx
import { useState, useEffect, useCallback } from 'react';
import { getFeatureData, type FeatureData } from '../api';

export default function FeatureTab() {
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [data, setData] = useState<FeatureData | null>(null);
  const [autoRefresh, setAutoRefresh] = useState(false);

  const fetchData = useCallback(async () => {
    try {
      setError(null);
      const result = await getFeatureData();
      setData(result);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load');
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => { fetchData(); }, [fetchData]);

  // Auto-refresh effect
  useEffect(() => {
    if (!autoRefresh) return;
    const interval = setInterval(fetchData, 30000);
    return () => clearInterval(interval);
  }, [autoRefresh, fetchData]);

  if (loading) return <LoadingState />;
  if (error) return <ErrorState error={error} onRetry={fetchData} />;

  return (
    <div className="space-y-6 animate-fade-in">
      <Header autoRefresh={autoRefresh} onAutoRefreshChange={setAutoRefresh} onRefresh={fetchData} />
      <SummaryCards data={data} />
      <DetailCards data={data} />
    </div>
  );
}

<div className="flex items-center justify-center py-12">
  <div className="flex flex-col items-center gap-3">
    <div className="spinner" />
    <p className="text-sm text-muted-foreground">Loading...</p>
  </div>
</div>

<div className="card p-6">
  <div className="flex items-center gap-3 text-destructive">
    <svg>...</svg>
    <div>
      <p className="font-medium">Failed to load</p>
      <p className="text-sm text-muted-foreground">{error}</p>
    </div>
  </div>
  <button onClick={onRetry} className="btn btn-secondary mt-4">
    Try Again
  </button>
</div>

<div className="card p-5">
  <div className="flex items-center gap-3 mb-4">
    <div className="w-8 h-8 rounded-lg bg-blue-100 dark:bg-blue-900/30 flex items-center justify-center">
      <svg className="w-4 h-4 text-blue-600 dark:text-blue-400">...</svg>
    </div>
    <div>
      <h3 className="font-semibold">Card Title</h3>
      <p className="text-xs text-muted-foreground">Subtitle</p>
    </div>
  </div>
  {/* Card content */}
</div>

<span
  className={`px-2 py-1 text-xs font-medium rounded-full ${
    status === 'success'
      ? 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-400'
      : status === 'error'
        ? 'bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-400'
        : 'bg-gray-100 text-gray-700 dark:bg-gray-900/30 dark:text-gray-400'
  }`}
>
  {statusLabel}
</span>

// In routes.ts
export type FeatureView = 'overview' | 'details' | 'settings';

export const ROUTES = {
  FEATURE: '/feature',
  FEATURE_OVERVIEW: '/feature/overview',
  FEATURE_DETAILS: '/feature/details',
  FEATURE_SETTINGS: '/feature/settings',
};

// In App.tsx - render sub-tabs
{globalView === 'feature' && (
  <div className="flex gap-1 mb-6 p-1 bg-secondary rounded-lg w-fit border border-border">
    <Link to={ROUTES.FEATURE_OVERVIEW} className={...}>Overview</Link>
    <Link to={ROUTES.FEATURE_DETAILS} className={...}>Details</Link>
    <Link to={ROUTES.FEATURE_SETTINGS} className={...}>Settings</Link>
  </div>
)}