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/routes/cards.py

@@ -56,11 +56,38 @@ async def draw_card(
         await db.commit()
         return result
         
+    except ValueError as e:
+        # Handle daily limit error
+        await db.rollback()
+        raise HTTPException(status_code=429, detail=str(e))
     except Exception as e:
         await db.rollback()
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@router.get("/draw-status/{user_did}")
+async def get_draw_status(
+    user_did: str,
+    db: AsyncSession = Depends(get_session)
+):
+    """
+    ユーザーのガチャ実行状況を取得
+    
+    - **user_did**: ユーザーのatproto DID
+    """
+    from app.core.config import settings
+    
+    user_repo = UserRepository(db)
+    can_draw = await user_repo.can_draw_card(user_did, settings.draw_limit_days)
+    next_draw_time = await user_repo.get_next_draw_time(user_did, settings.draw_limit_days)
+    
+    return {
+        "can_draw": can_draw,
+        "next_draw_time": next_draw_time.isoformat() if next_draw_time else None,
+        "draw_limit_days": settings.draw_limit_days
+    }
+
+
 @router.get("/user/{user_did}", response_model=List[Card])
 async def get_user_cards(
     user_did: str,