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/db/models.py

@@ -23,6 +23,7 @@ class User(Base):
     handle = Column(String, nullable=True)
     created_at = Column(DateTime, default=datetime.utcnow)
     updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    last_draw_date = Column(DateTime, nullable=True)
     
     # Relationships
     cards = relationship("UserCard", back_populates="owner")