feat(backend): tunable planner weights via family profile config

- Add planner_config JSONB to family_profile model + migration
- Add PlannerConfig.merge(overrides) + to_dict() for family-level override merging
- generate_meal_plan merges family.planner_config into DEFAULT before filtering/scoring/selection
- New endpoints on /api/profile:
  - GET /planner-config — returns merged effective config
  - PUT /planner-config — partial override validation + merge
  - DELETE /planner-config — reset to system defaults
- Schemas: PlannerConfigOverride, PlannerConfigResponse, PlannerConfigUpdateRequest
  with weight-sum validation (0.999–1.001)
- Export RecipeBase/Create/Read/Update from schemas/__init__ to resolve forward refs

backend/app/schemas/__init__.py

@@ -1,8 +1,26 @@
-from pydantic import BaseModel, Field, model_validator
-from typing import Optional, List, Any
-from uuid import UUID
-from datetime import date, datetime
+from __future__ import annotations
+
+from decimal import Decimal
 from enum import Enum
+from typing import Any, Dict, List, Optional
+from uuid import UUID
+
+from pydantic import BaseModel, Field, model_validator
+
+# Re-export from submodules so forward references resolve
+from .recipe import (
+    RecipeBase,
+    RecipeCreate,
+    RecipeIngredientRef,
+    RecipeRead,
+    RecipeUpdate,
+    ResolveIngredientCandidate,
+    ResolveIngredientRequest,
+    ResolveIngredientResponse,
+)
+
+# These may be referenced by other models; re-export as aliases if needed.
+RecipeResponse = RecipeRead
 
 
 class FamilyMemberRole(str, Enum):
@@ -97,16 +115,66 @@ class FamilyProfileBase(BaseModel):
     budget_per_meal: float = 50.00
 
 
-class FamilyProfileResponse(FamilyProfileBase):
+class FamilyProfileResponse(BaseModel):
     id: UUID
+    name: str
+    household_size: int
+    adult_count: int
+    child_count: int
+    dietary_notes: Optional[str] = None
+    budget_per_meal: float = 50.00
     created_at: Optional[datetime] = None
     updated_at: Optional[datetime] = None
     members: List[FamilyMemberResponse] = []
+    planner_config: Optional[dict] = None
 
     class Config:
         from_attributes = True
 
 
+class PlannerConfigOverride(BaseModel):
+    recency_weeks: Optional[int] = Field(default=None, ge=0)
+    calorie_tolerance_pct: Optional[int] = Field(default=None, ge=0, le=100)
+    max_total_minutes: Optional[int] = Field(default=None, ge=0)
+    max_meal_cost: Optional[float] = Field(default=None, ge=0)
+    w_savings: Optional[float] = Field(default=None, ge=0, le=1)
+    w_coverage: Optional[float] = Field(default=None, ge=0, le=1)
+    w_pantry: Optional[float] = Field(default=None, ge=0, le=1)
+    w_time: Optional[float] = Field(default=None, ge=0, le=1)
+    w_recency: Optional[float] = Field(default=None, ge=0, le=1)
+    time_ideal_minutes: Optional[int] = Field(default=None, ge=0)
+    time_full_minutes: Optional[int] = Field(default=None, ge=0)
+    recency_full_weeks: Optional[int] = Field(default=None, ge=0)
+    top_k: Optional[int] = Field(default=None, ge=1)
+    set_size: Optional[int] = Field(default=None, ge=1)
+    p_protein: Optional[float] = Field(default=None, ge=0)
+    p_cuisine: Optional[float] = Field(default=None, ge=0)
+
+
+class PlannerConfigResponse(BaseModel):
+    recency_weeks: int
+    calorie_tolerance_pct: int
+    max_total_minutes: int
+    max_meal_cost: float
+    w_savings: float
+    w_coverage: float
+    w_pantry: float
+    w_time: float
+    w_recency: float
+    time_ideal_minutes: int
+    time_full_minutes: int
+    recency_full_weeks: int
+    top_k: int
+    set_size: int
+    p_protein: float
+    p_cuisine: float
+    source: str = "default"
+
+
+class PlannerConfigUpdateRequest(BaseModel):
+    planner_config: PlannerConfigOverride
+
+
 class FamilyProfileCreate(FamilyProfileBase):
     pass
 
@@ -118,56 +186,7 @@ class FamilyProfileUpdate(BaseModel):
     child_count: Optional[int] = None
     dietary_notes: Optional[str] = None
     budget_per_meal: Optional[float] = None
-
-
-class RecipeIngredient(BaseModel):
-    ingredient_id: Optional[UUID] = None
-    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):
-    name: str
-    description: Optional[str] = None
-    image_url: Optional[str] = None
-    image_source: Optional[str] = None
-    prep_time_minutes: Optional[int] = None
-    cook_time_minutes: Optional[int] = None
-    servings: int
-    servings_scaled: Optional[int] = None
-    cuisine_tags: Optional[List[str]] = []
-    dietary_tags: Optional[List[str]] = []
-    protein_type: Optional[str] = None
-    spice_level: Optional[int] = None
-    ingredients: List[RecipeIngredient] = []
-    instructions: List[str] = []
-    source_url: Optional[str] = None
-    is_manually_added: bool = False
-
-
-class RecipeResponse(RecipeBase):
-    id: UUID
-    family_profile_id: Optional[UUID] = None
-    scraped_at: Optional[datetime] = None
-    created_at: Optional[datetime] = None
-    updated_at: Optional[datetime] = None
-    total_time_minutes: Optional[int] = None
-
-    class Config:
-        from_attributes = True
+    planner_config: Optional[dict] = None
 
 
 class RecipeCreate(RecipeBase):