feat(backend): persist plan scores on MealPlanItem

- Migration 0012 adds score (float) and components (jsonb) to meal_plan_item
- generate.py: populates score and components at create time
- schemas/MealPlanItemResponse: include score + components fields
- GET /api/meal-plans/{id}: returns persisted values instead of zeros

backend/app/api/meal_plans.py

@@ -125,8 +125,7 @@ def get_plan(plan_id: UUID, db: Session = Depends(get_db)) -> GenerationResponse
         .order_by(MealPlanItem.day_of_week)
         .all()
     )
-    # Read-after-create: scores not stored on MealPlanItem, so we return zeros
-    # for score/components. The original generate response is authoritative.
+    # Read-after-create: scores now stored on MealPlanItem
     return GenerationResponse(
         meal_plan_id=plan.id,
         week_start_date=plan.week_start_date,
@@ -135,8 +134,8 @@ def get_plan(plan_id: UUID, db: Session = Depends(get_db)) -> GenerationResponse
                 recipe_id=it.recipe_id,
                 day_of_week=it.day_of_week,
                 estimated_cost=it.estimated_cost or 0,
-                score=0.0,
-                components={},
+                score=it.score or 0.0,
+                components={k: float(v) for k, v in (it.components.items() if it.components else [])},
             )
             for it in items
         ],

backend/app/models/__init__.py

@@ -1,5 +1,5 @@
 from sqlalchemy import (
-    Column, String, Integer, Numeric, Text, Boolean, Date, DateTime,
+    Column, String, Integer, Numeric, Float, Text, Boolean, Date, DateTime,
     ForeignKey, CheckConstraint, UniqueConstraint, Enum as SQLEnum
 )
 from sqlalchemy.dialects.postgresql import UUID, JSONB, ARRAY
@@ -228,6 +228,8 @@ class MealPlanItem(Base):
     denial_reason = Column(SQLEnum(DenialReason, name="denial_reason_enum", create_type=False, values_callable=lambda obj: [e.value for e in obj]))
     denial_details = Column(Text)
     estimated_cost = Column(Numeric(10, 2))
+    score = Column(Float)
+    components = Column(JSONB)
     used_pantry_items = Column(ARRAY(UUID(as_uuid=True)))
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

backend/app/schemas/__init__.py

@@ -188,6 +188,8 @@ class MealPlanItemResponse(MealPlanItemBase):
     denial_reason: Optional[DenialReason] = None
     denial_details: Optional[str] = None
     used_pantry_items: Optional[List[UUID]] = []
+    score: Optional[float] = None
+    components: Optional[Dict[str, float]] = None
     created_at: Optional[datetime] = None
     updated_at: Optional[datetime] = None
     recipe: Optional[RecipeResponse] = None

backend/app/services/planner/generate.py

@@ -196,6 +196,8 @@ def generate_meal_plan(
             meal_type=meal_type,
             approval_status=MealPlanItemStatus.pending,
             estimated_cost=scored_recipe.cost.total_cost,
+            score=scored_recipe.score,
+            components=scored_recipe.components,
         )
         db.add(item)