Create new services: inventory, recipes, suppliers

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+# 📦 Inventory Frontend Implementation
+
+## Overview
+
+This document details the complete frontend implementation for the inventory management system, providing a comprehensive interface for managing bakery products, stock levels, alerts, and analytics.
+
+## 🏗️ Architecture Overview
+
+### Frontend Structure
+
+```
+frontend/src/
+├── api/
+│   ├── services/
+│   │   └── inventory.service.ts     # Complete API client
+│   └── hooks/
+│       └── useInventory.ts          # React hooks for state management
+├── components/
+│   └── inventory/
+│       ├── InventoryItemCard.tsx    # Product display card
+│       └── StockAlertsPanel.tsx     # Alerts management
+└── pages/
+    └── inventory/
+        └── InventoryPage.tsx        # Main inventory page
+```
+
+## 🔧 Core Components
+
+### 1. Inventory Service (`inventory.service.ts`)
+
+**Complete API Client** providing:
+- **CRUD Operations**: Create, read, update, delete inventory items
+- **Stock Management**: Adjustments, movements, level tracking
+- **Alerts System**: Stock alerts, acknowledgments, filtering
+- **Analytics**: Dashboard data, reports, value calculations
+- **Search & Filters**: Advanced querying with pagination
+- **Import/Export**: CSV/Excel data handling
+
+**Key Features:**
+```typescript
+// Product Management
+getInventoryItems(tenantId, params) // Paginated, filtered items
+createInventoryItem(tenantId, data) // New product creation
+updateInventoryItem(tenantId, id, data) // Product updates
+
+// Stock Operations
+adjustStock(tenantId, itemId, adjustment) // Stock changes
+getStockLevel(tenantId, itemId) // Current stock info
+getStockMovements(tenantId, params) // Movement history
+
+// Alerts & Analytics
+getStockAlerts(tenantId) // Current alerts
+getDashboardData(tenantId) // Summary analytics
+```
+
+### 2. Inventory Hooks (`useInventory.ts`)
+
+**Three Specialized Hooks:**
+
+#### `useInventory()` - Main Management Hook
+- **State Management**: Items, stock levels, alerts, pagination
+- **Auto-loading**: Configurable data fetching
+- **CRUD Operations**: Complete product lifecycle management
+- **Real-time Updates**: Optimistic updates with error handling
+- **Search & Filtering**: Dynamic query management
+
+#### `useInventoryDashboard()` - Dashboard Hook
+- **Quick Stats**: Total items, low stock, expiring products, value
+- **Alerts Summary**: Unacknowledged alerts with counts
+- **Performance Metrics**: Load times and error handling
+
+#### `useInventoryItem()` - Single Item Hook
+- **Detailed View**: Individual product management
+- **Stock Operations**: Direct stock adjustments
+- **Movement History**: Recent transactions
+- **Real-time Sync**: Auto-refresh on changes
+
+### 3. Inventory Item Card (`InventoryItemCard.tsx`)
+
+**Flexible Product Display Component:**
+
+**Compact Mode** (List View):
+- Clean horizontal layout
+- Essential information only
+- Quick stock status indicators
+- Minimal actions
+
+**Full Mode** (Grid View):
+- Complete product details
+- Stock level visualization
+- Special requirements indicators (refrigeration, seasonal, etc.)
+- Quick stock adjustment interface
+- Action buttons (edit, view, delete)
+
+**Key Features:**
+- **Stock Status**: Color-coded indicators (good, low, out-of-stock, reorder)
+- **Expiration Alerts**: Visual warnings for expired/expiring items
+- **Quick Adjustments**: In-place stock add/remove functionality
+- **Product Classification**: Visual distinction between ingredients vs finished products
+- **Storage Requirements**: Icons for refrigeration, freezing, seasonal items
+
+### 4. Stock Alerts Panel (`StockAlertsPanel.tsx`)
+
+**Comprehensive Alerts Management:**
+
+**Alert Types Supported:**
+- **Low Stock**: Below minimum threshold
+- **Expired**: Past expiration date
+- **Expiring Soon**: Within warning period
+- **Overstock**: Exceeding maximum levels
+
+**Features:**
+- **Severity Levels**: Critical, high, medium, low with color coding
+- **Bulk Operations**: Multi-select acknowledgment
+- **Filtering**: By type, status, severity
+- **Time Tracking**: "Time ago" display for alert creation
+- **Quick Actions**: View item, acknowledge alerts
+- **Visual Hierarchy**: Clear severity and status indicators
+
+### 5. Main Inventory Page (`InventoryPage.tsx`)
+
+**Complete Inventory Management Interface:**
+
+#### Header Section
+- **Quick Stats Cards**: Total products, low stock count, expiring items, total value
+- **Action Bar**: Add product, refresh, toggle alerts panel
+- **Alert Indicator**: Badge showing unacknowledged alerts count
+
+#### Search & Filtering
+- **Text Search**: Real-time product name search
+- **Advanced Filters**: 
+  - Product type (ingredients vs finished products)
+  - Category filtering
+  - Active/inactive status
+  - Stock status filters (low stock, expiring soon)
+  - Sorting options (name, category, stock level, creation date)
+- **Filter Persistence**: Maintains filter state during navigation
+
+#### View Modes
+- **Grid View**: Card-based layout with full details
+- **List View**: Compact horizontal layout for efficiency
+- **Responsive Design**: Adapts to screen size automatically
+
+#### Pagination
+- **Performance Optimized**: Loads 20 items per page by default
+- **Navigation Controls**: Page numbers with current page highlighting
+- **Item Counts**: Shows "X to Y of Z items" information
+
+## 🎨 Design System
+
+### Color Coding
+- **Product Types**: Blue for ingredients, green for finished products
+- **Stock Status**: Green (good), yellow (low), orange (reorder), red (out/expired)
+- **Alert Severity**: Red (critical), orange (high), yellow (medium), blue (low)
+
+### Icons
+- **Product Management**: Package, Plus, Edit, Eye, Trash
+- **Stock Operations**: TrendingUp/Down, Plus/Minus, AlertTriangle
+- **Storage**: Thermometer (refrigeration), Snowflake (freezing), Calendar (seasonal)
+- **Navigation**: Search, Filter, Grid, List, Refresh
+
+### Layout Principles
+- **Mobile-First**: Responsive design starting from 320px
+- **Touch-Friendly**: Large buttons and touch targets
+- **Information Hierarchy**: Clear visual hierarchy with proper spacing
+- **Loading States**: Skeleton screens and spinners for better UX
+
+## 📊 Data Flow
+
+### 1. Initial Load
+```
+Page Load → useInventory() → loadItems() → API Call → State Update → UI Render
+```
+
+### 2. Filter Application
+```
+Filter Change → useInventory() → loadItems(params) → API Call → Items Update
+```
+
+### 3. Stock Adjustment
+```
+Quick Adjust → adjustStock() → API Call → Optimistic Update → Confirmation/Rollback
+```
+
+### 4. Alert Management
+```
+Alert Click → acknowledgeAlert() → API Call → Local State Update → UI Update
+```
+
+## 🔄 State Management
+
+### Local State Structure
+```typescript
+{
+  // Core data
+  items: InventoryItem[],
+  stockLevels: Record<string, StockLevel>,
+  alerts: StockAlert[],
+  dashboardData: InventoryDashboardData,
+  
+  // UI state
+  isLoading: boolean,
+  error: string | null,
+  pagination: PaginationInfo,
+  
+  // User preferences
+  viewMode: 'grid' | 'list',
+  filters: FilterState,
+  selectedItems: Set<string>
+}
+```
+
+### Optimistic Updates
+- **Stock Adjustments**: Immediate UI updates with rollback on error
+- **Alert Acknowledgments**: Instant visual feedback
+- **Item Updates**: Real-time reflection of changes
+
+### Error Handling
+- **Network Errors**: Graceful degradation with retry options
+- **Validation Errors**: Clear user feedback with field-level messages
+- **Loading States**: Skeleton screens and progress indicators
+- **Fallback UI**: Empty states with actionable suggestions
+
+## 🚀 Performance Optimizations
+
+### Loading Strategy
+- **Lazy Loading**: Components loaded on demand
+- **Pagination**: Limited items per page for performance
+- **Debounced Search**: Reduces API calls during typing
+- **Cached Requests**: Intelligent caching of frequent data
+
+### Memory Management
+- **Cleanup**: Proper useEffect cleanup to prevent memory leaks
+- **Optimized Re-renders**: Memoized callbacks and computed values
+- **Efficient Updates**: Targeted state updates to minimize re-renders
+
+### Network Optimization
+- **Parallel Requests**: Dashboard data loaded concurrently
+- **Request Deduplication**: Prevents duplicate API calls
+- **Intelligent Polling**: Conditional refresh based on user activity
+
+## 📱 Mobile Experience
+
+### Responsive Breakpoints
+- **Mobile**: 320px - 767px (single column, compact cards)
+- **Tablet**: 768px - 1023px (dual column, medium cards)  
+- **Desktop**: 1024px+ (multi-column grid, full cards)
+
+### Touch Interactions
+- **Swipe Gestures**: Consider for future card actions
+- **Large Touch Targets**: Minimum 44px for all interactive elements
+- **Haptic Feedback**: Future consideration for mobile apps
+
+### Mobile-Specific Features
+- **Pull-to-Refresh**: Standard mobile refresh pattern
+- **Bottom Navigation**: Consider for mobile navigation
+- **Modal Dialogs**: Full-screen modals on small screens
+
+## 🧪 Testing Strategy
+
+### Unit Tests
+- **Service Methods**: API client functionality
+- **Hook Behavior**: State management logic
+- **Component Rendering**: UI component output
+- **Error Handling**: Error boundary behavior
+
+### Integration Tests
+- **User Workflows**: Complete inventory management flows
+- **API Integration**: Service communication validation
+- **State Synchronization**: Data consistency across components
+
+### E2E Tests
+- **Critical Paths**: Add product → Stock adjustment → Alert handling
+- **Mobile Experience**: Touch interactions and responsive behavior
+- **Performance**: Load times and interaction responsiveness
+
+## 🔧 Configuration Options
+
+### Customizable Settings
+```typescript
+// Hook configuration
+useInventory({
+  autoLoad: true,           // Auto-load on mount
+  refreshInterval: 30000,   // Auto-refresh interval
+  pageSize: 20             // Items per page
+})
+
+// Component props
+<InventoryItemCard
+  compact={true}           // Compact vs full display
+  showActions={true}       // Show action buttons
+  showQuickAdjust={true}   // Enable quick stock adjustment
+/>
+```
+
+### Feature Flags
+- **Quick Adjustments**: Can be disabled for stricter control
+- **Bulk Operations**: Enable/disable bulk selections
+- **Auto-refresh**: Configurable refresh intervals
+- **Advanced Filters**: Toggle complex filtering options
+
+## 🎯 Future Enhancements
+
+### Short-term Improvements
+1. **Drag & Drop**: Reorder items or categories
+2. **Keyboard Shortcuts**: Power user efficiency
+3. **Bulk Import**: Excel/CSV file upload for mass updates
+4. **Export Options**: PDF reports, detailed Excel exports
+
+### Medium-term Features
+1. **Barcode Scanning**: Mobile camera integration
+2. **Voice Commands**: "Add 10 flour" voice input
+3. **Offline Support**: PWA capabilities for unstable connections
+4. **Real-time Sync**: WebSocket updates for multi-user environments
+
+### Long-term Vision
+1. **AI Suggestions**: Smart reorder recommendations
+2. **Predictive Analytics**: Demand forecasting integration
+3. **Supplier Integration**: Direct ordering from suppliers
+4. **Recipe Integration**: Automatic ingredient consumption based on production
+
+## 📋 Implementation Checklist
+
+### ✅ Core Features Complete
+- [x] **Complete API Service** with all endpoints
+- [x] **React Hooks** for state management
+- [x] **Product Cards** with full/compact modes
+- [x] **Alerts Panel** with filtering and bulk operations
+- [x] **Main Page** with search, filters, and pagination
+- [x] **Responsive Design** for all screen sizes
+- [x] **Error Handling** with graceful degradation
+- [x] **Loading States** with proper UX feedback
+
+### ✅ Integration Complete
+- [x] **Service Registration** in API index
+- [x] **Hook Exports** in hooks index
+- [x] **Type Safety** with comprehensive TypeScript
+- [x] **State Management** with optimistic updates
+
+### 🚀 Ready for Production
+The inventory frontend is **production-ready** with:
+- Complete CRUD operations
+- Real-time stock management
+- Comprehensive alerts system
+- Mobile-responsive design
+- Performance optimizations
+- Error handling and recovery
+
+---
+
+## 🎉 Summary
+
+The inventory frontend implementation provides a **complete, production-ready solution** for bakery inventory management with:
+
+- **User-Friendly Interface**: Intuitive design with clear visual hierarchy
+- **Powerful Features**: Comprehensive product and stock management
+- **Mobile-First**: Responsive design for all devices
+- **Performance Optimized**: Fast loading and smooth interactions
+- **Scalable Architecture**: Clean separation of concerns and reusable components
+
+**The system is ready for immediate deployment and user testing!** 🚀