Fix import statements for package consistency

[fbraza]

Issue Description

As identified in the code review for PR #2, there are import issues that need to be fixed for proper package structure.

Problem

• vitals/biomarkers/helpers.py:3 - Uses import schemas instead of relative import
• vitals/score2/compute.py:9 - Should use relative imports within the package

Current Code

# In helpers.py
import schemas

# In compute.py
from biomarkers import helpers, schemas

Expected Fix

# In helpers.py
from . import schemas

# In compute.py
from ..biomarkers import helpers, schemas

Impact

This is a critical issue that affects module imports and package structure consistency.

Related

• PR feat: Implement SCORE2 cardiovascular risk assessment algorithm #2: feat: Implement SCORE2 cardiovascular risk assessment algorithm

[fbraza]

Fixed in #11