fix: Phase 0b - body_progress_score uses correct column name

Bug: Filtered goals by g.get('type_key') but goals table has 'goal_type' column.
Result: weight_goals was always empty → _score_weight_trend returned None.

Fix: Changed 'type_key' → 'goal_type' (matches goals table schema).

Verified: Migration 022 defines goal_type column, not type_key.

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

backend/calculations/body_metrics.py

@@ -386,7 +386,7 @@ def _score_weight_trend(profile_id: str) -> Optional[int]:
     from goal_utils import get_active_goals
 
     goals = get_active_goals(profile_id)
-    weight_goals = [g for g in goals if g.get('type_key') == 'weight']
+    weight_goals = [g for g in goals if g.get('goal_type') == 'weight']
     if not weight_goals:
         return None