Add AI-powered content generation and improvement capabilities for product and brand content using Anthropic's Claude API.
## Core Services
- AiClient service: Claude API integration with rewrite modes (rewrite, shorten, expand, professional)
- AiSetting model: Encrypted API key storage, provider configuration
- Configuration caching for performance (5-minute cache)
## Controllers
- AiCopilotController: General AI preview endpoint for products/promotions/menus/templates
- BrandCopilotController: Brand-specific AI content generation
- Admin AiSettingsController: Super admin AI configuration management
## Admin Interface
- Filament AI Settings page: Configure provider, model, API key
- Settings stored encrypted in database
- Enable/disable AI features globally
## Features
- Generate new content from scratch
- Improve existing content
- Apply brand voice consistency
- Context-aware suggestions (product/promotion/menu/template)
- Character limit enforcement
- Stub responses for testing (full API integration ready)
## Security
- API keys encrypted at rest using Laravel's encrypt()
- Business-level module gating (hasAiCopilot())
- Admin-only configuration access
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