feat: Phase 8 Feedback UI + API endpoints

- New backend/app/api/feedback.py: GET/POST for meal_plan_item feedback
- MealDetail.tsx: star rating, never-suggest checkbox, reason dropdown,
  free-text comments, displays saved feedback
- frontend/src/api/index.ts + types: feedback API + TypeScript interface
- backend/app/schemas/__init__.py: model_validator maps qty→quantity for
  RecipeIngredient (fixes Pydantic validation on recipe JSONB)
- docs/HANDOFF.md: mark Phase 8 complete, update file map and date

backend/app/schemas/__init__.py

@@ -1,4 +1,4 @@
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, model_validator
 from typing import Optional, List, Any
 from uuid import UUID
 from datetime import date, datetime
@@ -122,10 +122,21 @@ class FamilyProfileUpdate(BaseModel):
 
 class RecipeIngredient(BaseModel):
     ingredient_id: Optional[UUID] = None
-    name: str
+    name: Optional[str] = None
     quantity: Optional[float] = None
     unit: Optional[str] = None
     is_optional: bool = False
+    notes: Optional[str] = None
+
+    @model_validator(mode="before")
+    @classmethod
+    def _normalize(cls, data):
+        if not isinstance(data, dict):
+            return data
+        # JSONB stores qty; schema uses quantity
+        if "qty" in data and "quantity" not in data:
+            data["quantity"] = data.pop("qty")
+        return data
 
 
 class RecipeBase(BaseModel):