feat: Add QuotePro ERP - Complete React prototype with design system

packages/quotepro-erp/.eslintrc.json

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+{
+  "root": true,
+  "env": { "browser": true, "es2020": true },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:react-hooks/recommended"
+  ],
+  "ignorePatterns": ["dist", ".eslintrc.json"],
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["react-refresh"],
+  "rules": {
+    "react-refresh/only-export-components": [
+      "warn",
+      { "allowConstantExport": true }
+    ]
+  }
+}

packages/quotepro-erp/.gitignore

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+node_modules
+dist
+dist-ssr
+*.local
+.env
+.env.local
+.env.*.local

packages/quotepro-erp/ARCHITECTURE.md

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+# QuotePro ERP - Architecture Documentation
+
+## System Architecture
+
+### Frontend Architecture
+```
+┌─────────────────────────────────────────────────┐
+│                 React App (Vite)               │
+├─────────────────────────────────────────────────┤
+│ React Router v6                                 │
+│ ├── Public Routes (Login)                      │
+│ ├── Protected Routes (Dashboard, etc)          │
+│ └── Catch-all (404)                            │
+├─────────────────────────────────────────────────┤
+│ Components Layer                                │
+│ ├── Layout Components (Header, Sidebar)        │
+│ ├── Common Components (Button, Input, etc)     │
+│ └── Page Components                            │
+├─────────────────────────────────────────────────┤
+│ State Management (Zustand)                      │
+│ ├── Auth Store                                 │
+│ ├── Data Stores (Quotations, Clients, etc)    │
+│ └── UI Stores (Toast, Theme)                  │
+├─────────────────────────────────────────────────┤
+│ Business Logic                                  │
+│ ├── Custom Hooks (useTheme, useForm)          │
+│ ├── Utilities (formatters, validators)        │
+│ └── API Handlers (ready for backend)          │
+├─────────────────────────────────────────────────┤
+│ Styling                                        │
+│ ├── Tailwind CSS                              │
+│ ├── Design Tokens (colors, spacing)           │
+│ └── Dark Mode Support                         │
+└─────────────────────────────────────────────────┘
+```
+
+### Data Flow
+```
+User Action
+    ↓
+Component Handler
+    ↓
+Store Update (Zustand)
+    ↓
+Component Re-render
+    ↓
+UI Update
+```
+
+### Component Hierarchy
+```
+App
+├── ThemeProvider
+│   └── BrowserRouter
+│       └── Routes
+│           ├── /login → LoginPage
+│           ├── /dashboard → Layout → DashboardPage
+│           ├── /quotations → Layout → QuotationsPage
+│           ├── /clients → Layout → ClientsPage
+│           ├── /products → Layout → ProductsPage
+│           ├── /settings → Layout → SettingsPage
+│           └── * → NotFoundPage
+```
+
+## Component Design Patterns
+
+### 1. Smart Components (Containers)
+- Handle business logic
+- Connect to stores
+- Manage state
+- Examples: DashboardPage, ClientsPage
+
+### 2. Dumb Components (Presentational)
+- Receive props
+- Render UI
+- No side effects
+- Examples: Button, Card, Badge
+
+### 3. Layout Components
+- Provide structure
+- Manage navigation
+- Responsive behavior
+- Examples: Layout, Sidebar, Header
+
+## State Management Strategy
+
+### Global State (Zustand Stores)
+```typescript
+// Auth Store
+- user (User | null)
+- isAuthenticated (boolean)
+- login, logout, register
+
+// Quotation Store
+- quotations (Quote[])
+- addQuotation, updateQuotation, deleteQuotation
+
+// Client Store
+- clients (Client[])
+- addClient, updateClient, deleteClient
+
+// Product Store
+- products (Product[])
+- addProduct, updateProduct, deleteProduct
+
+// Tender Store
+- tenders (Tender[])
+- addTender, updateTender, deleteTender
+```
+
+### Local State
+- Component UI state (modals, dropdowns)
+- Form field values
+- Loading states
+
+### Context API
+- Theme context (light/dark mode)
+- Toast notifications
+
+## Styling Strategy
+
+### 1. Tailwind CSS
+- Utility-first CSS
+- Design tokens in config
+- Consistent spacing and colors
+
+### 2. CSS Variables
+- Brand colors
+- Typography scales
+- Shadow definitions
+
+### 3. Component Scoping
+- No global CSS pollution
+- Modular component styling
+- Easy maintenance
+
+## Performance Optimizations
+
+### Code Splitting
+- React Router lazy loading ready
+- Component-based splitting
+- Reduced initial bundle
+
+### Memoization
+- React.memo for pure components
+- useMemo for expensive calculations
+- useCallback for event handlers
+
+### Image Optimization
+- Avatar lazy loading
+- Icon optimization (Lucide)
+- SVG usage
+
+## Type Safety
+
+### TypeScript Coverage
+- All components fully typed
+- Store types defined
+- Utility functions typed
+- Props interfaces
+
+### Key Type Files
+- `src/types/index.ts` - Core business types
+- Component prop interfaces inline
+- Hook return types defined
+
+## Authentication Flow
+
+```
+1. User visits /login
+2. Enters credentials
+3. Submit → useAuthStore.login()
+4. Store updates auth state
+5. Redirect to /dashboard
+6. Protected routes check isAuthenticated
+7. If false → redirect to /login
+```
+
+## Form Handling
+
+### useForm Hook
+```typescript
+1. Initialize with values
+2. Get field props (value, onChange, onBlur)
+3. Handle submit
+4. Validate and submit
+5. Reset form
+```
+
+## Error Handling
+
+### Component Level
+- Try-catch in async operations
+- Error state in components
+- Error alerts to user
+
+### Store Level
+- Error state in stores
+- Error messages propagated
+- Retry logic
+
+### API Level (Ready for backend)
+- Network error handling
+- Timeout handling
+- Retry mechanism
+
+## Testing Strategy
+
+### Unit Tests
+- Utility functions
+- Validators
+- Formatters
+
+### Component Tests
+- Props rendering
+- Event handlers
+- State changes
+
+### Integration Tests
+- Page workflows
+- Store interactions
+- Navigation flows
+
+### E2E Tests
+- User journeys
+- Complete workflows
+- Cross-browser testing
+
+## Security Considerations
+
+### Frontend Security
+- ✅ Input validation
+- ✅ XSS prevention (React escaping)
+- ✅ Protected routes
+- ✅ localStorage for tokens (to be replaced with secure cookies)
+
+### Backend Ready
+- ✅ Auth token structure
+- ✅ API error handling
+- ✅ CORS headers
+- ✅ Rate limiting
+
+## Deployment Strategy
+
+### Development
+- Local dev server (Vite)
+- Hot module replacement
+- Source maps
+
+### Production Build
+- Optimized bundle
+- Minified assets
+- Tree shaking
+- Lazy loading
+
+### Hosting Options
+- Vercel (recommended)
+- Netlify
+- AWS S3 + CloudFront
+- Docker container
+
+## Scalability Features
+
+### Extensibility
+- Plugin architecture ready
+- Theme customization
+- Component composition
+- Store combination
+
+### Performance Scale
+- Pagination ready
+- Lazy loading ready
+- Virtual scrolling ready
+- Caching ready
+
+### Team Collaboration
+- Clear file structure
+- Component documentation
+- Type safety
+- Consistent patterns
+
+## Best Practices Implemented
+
+1. **DRY** - Reusable components and utilities
+2. **SOLID** - Single responsibility principle
+3. **Clean Code** - Readable, maintainable code
+4. **Performance** - Optimized rendering
+5. **Accessibility** - ARIA labels, semantic HTML
+6. **Security** - Input validation, protected routes
+7. **Documentation** - Code comments, README files
+8. **Testing** - Test-ready architecture
+
+## Future Enhancements
+
+### Short Term
+- Backend API integration
+- Database connectivity
+- Advanced filtering
+- Bulk operations
+
+### Medium Term
+- Real-time notifications
+- Advanced analytics
+- Export to PDF/Excel
+- Email integration
+
+### Long Term
+- Mobile app (React Native)
+- AI/ML features
+- Offline support
+- Advanced collaboration
+
+---
+
+This architecture provides a solid foundation for a production-grade quotation and tender management system.