fix: Phase 0b - fix last sleep column names in health_stability_score

Fixed remaining sleep_log column name errors in calculate_health_stability_score:
- SELECT: total_sleep_min, deep_min, rem_min → duration_minutes, deep_minutes, rem_minutes
- _score_sleep_quality: Updated dict access to use new column names

This was blocking goal_progress_score from calculating.

Changes:
- scores.py: Fixed sleep_log SELECT query and _score_sleep_quality dict access

This should be the LAST column name bug! All Phase 0b calculations should now work.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/calculations/scores.py

@@ -218,7 +218,7 @@ def calculate_health_stability_score(profile_id: str) -> Optional[int]:
 
         # 2. Sleep quality (25%)
         cur.execute("""
-            SELECT total_sleep_min, deep_min, rem_min
+            SELECT duration_minutes, deep_minutes, rem_minutes
             FROM sleep_log
             WHERE profile_id = %s
               AND date >= CURRENT_DATE - INTERVAL '28 days'
@@ -317,7 +317,7 @@ def _score_blood_pressure(readings: List) -> int:
 def _score_sleep_quality(sleep_data: List) -> int:
     """Score sleep quality (0-100)"""
     # Average sleep duration and quality
-    avg_total = sum(s['total_sleep_min'] for s in sleep_data) / len(sleep_data)
+    avg_total = sum(s['duration_minutes'] for s in sleep_data) / len(sleep_data)
     avg_total_hours = avg_total / 60
 
     # Duration score (7+ hours = good)
@@ -333,8 +333,8 @@ def _score_sleep_quality(sleep_data: List) -> int:
     # Quality score (deep + REM percentage)
     quality_scores = []
     for s in sleep_data:
-        if s['deep_min'] and s['rem_min']:
-            quality_pct = ((s['deep_min'] + s['rem_min']) / s['total_sleep_min']) * 100
+        if s['deep_minutes'] and s['rem_minutes']:
+            quality_pct = ((s['deep_minutes'] + s['rem_minutes']) / s['duration_minutes']) * 100
             # 40-60% deep+REM is good
             if quality_pct >= 45:
                 quality_scores.append(100)