chore: initialize project repository with core extension files

- Add .gitignore to exclude node_modules, dist, logs, and system files
- Add comprehensive project documentation including README, deployment guide, and development setup
- Add .kiro project specifications for amazon-product-bar-extension, appwrite-cloud-storage, appwrite-userid-repair, blacklist-feature, and enhanced-item-management
- Add .kiro steering documents for product, structure, styling, and tech guidelines
- Add VSCode settings configuration for consistent development environment
- Add manifest.json and babel/vite configuration for extension build setup
- Add complete source code implementation including AppWrite integration, storage managers, UI components, and services
- Add comprehensive test suite with Jest configuration and 30+ test files covering all major modules
- Add test HTML files for integration testing and validation
- Add coverage reports and build validation scripts
- Add AppWrite setup and repair documentation for database schema management
- Add migration guides and responsive accessibility implementation documentation
- Establish foundation for Amazon product bar extension with full feature set including blacklist management, enhanced item workflows, and real-time synchronization

.kiro/steering/structure.md

@@ -0,0 +1,71 @@
+# Project Structure & Architecture
+
+## Directory Organization
+
+```
+├── src/                          # Source code
+│   ├── content.jsx              # Main entry point & content script
+│   ├── StaggeredMenu.jsx        # React menu component
+│   ├── StaggeredMenu.css        # Menu styles
+│   ├── *Manager.js              # Manager classes (storage, panels, etc.)
+│   ├── *Extractor.js            # Data extraction utilities
+│   ├── *Service.js              # External service integrations
+│   ├── Enhanced*.js             # Enhanced feature implementations
+│   ├── *.css                    # Component-specific styles
+│   └── __tests__/               # Test files
+├── dist/                        # Build output (generated)
+├── .kiro/                       # Kiro configuration
+│   ├── steering/                # Project steering rules
+│   └── specs/                   # Feature specifications
+├── test-*.html                  # Manual testing pages
+└── manifest.json                # Chrome extension manifest
+```
+
+## Architecture Patterns
+
+### Manager Pattern
+- **Purpose**: Encapsulate complex functionality into focused managers
+- **Examples**: `EnhancedStorageManager`, `ItemsPanelManager`, `BlacklistPanelManager`
+- **Responsibilities**: State management, UI coordination, data persistence
+
+### Event-Driven Communication
+- **Global Event Bus**: `window.amazonExtEventBus` for cross-component communication
+- **Event Types**: `product:saved`, `blacklist:updated`, `enhanced:item:saved`
+- **Pattern**: Emit events for state changes, listen for updates
+
+### Error Handling Strategy
+- **Centralized**: `ErrorHandler` class with retry logic and fallbacks
+- **User-Friendly**: Localized error messages (German/English)
+- **Graceful Degradation**: Fallback data when services fail
+
+## File Naming Conventions
+
+- **Managers**: `*Manager.js` (e.g., `EnhancedStorageManager.js`)
+- **Services**: `*Service.js` (e.g., `MistralAIService.js`)
+- **Extractors**: `*Extractor.js` (e.g., `ProductExtractor.js`)
+- **Components**: PascalCase for React components (e.g., `StaggeredMenu.jsx`)
+- **Tests**: `*.test.js` in `__tests__/` directory
+- **Styles**: Component-specific CSS files matching component names
+
+## Code Organization Principles
+
+### Class-Based Architecture
+- ES6 classes for managers and services
+- Constructor dependency injection
+- Public/private method distinction with JSDoc
+
+### React Integration
+- Functional components with hooks
+- React only for UI components (menu, panels)
+- DOM manipulation handled by vanilla JS managers
+
+### Storage Strategy
+- **localStorage**: Primary storage for extension data
+- **Keys**: Prefixed with `amazon-ext-` or `amazon_ext_`
+- **Cross-tab sync**: Storage event listeners for real-time updates
+
+### Testing Structure
+- **Unit tests**: Individual component testing
+- **Integration tests**: Manager interaction testing
+- **Property-based tests**: Using fast-check for robust validation
+- **Mocks**: localStorage, DOM APIs, external services