Integrate ai.card Rust API with ai.gpt MCP and implement daily limit system

### Major Changes:
- **Rust Migration**: Move api-rs to root directory, rename binary to 'aicard'
- **MCP Integration**: Add card tools to ai.gpt MCP server (get_user_cards, draw_card, get_draw_status)
- **Daily Limit System**: Implement 2-day interval card drawing limits in API and iOS
- **iOS Enhancements**: Add DrawStatusView, backup functionality, and limit integration

### Technical Details:
- ai.gpt MCP now has 20 tools including 3 card-related tools
- ServiceClient enhanced with missing card API methods
- iOS app includes daily limit UI and atproto OAuth backup features
- Database migration for last_draw_date field
- Complete feature parity between web and iOS implementations

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

python/api/app/core/config.py

@@ -34,6 +34,9 @@ class Settings(BaseSettings):
     # Unique card settings
     max_unique_cards: int = 1000  # Maximum number of unique cards
     
+    # Draw limit settings
+    draw_limit_days: int = 2  # Number of days between allowed draws (every other day)
+    
     # CORS
     cors_origins: list[str] = [
         "http://localhost:3000",