feat: manual nutrition entry on recipe editor

Lets authors enter nutrition values by hand instead of relying only on
the AI estimate; the detail-page panel now shows whether data was
manually entered or AI-estimated and offers to switch between them.

v0.35.0

packages/db/src/schema/recipes.ts

@@ -43,6 +43,7 @@ export const recipes = pgTable("recipes", {
   dietaryTags: jsonb("dietary_tags").$type<DietaryTags>().default({}),
   dietaryVerified: boolean("dietary_verified").notNull().default(false),
   nutritionData: jsonb("nutrition_data").$type<{ perServing: { calories: number; proteinG: number; carbsG: number; fatG: number; fiberG: number; sodiumMg: number } }>(),
+  nutritionManual: boolean("nutrition_manual").notNull().default(false),
   difficulty: difficultyEnum("difficulty"),
   prepMins: integer("prep_mins"),
   cookMins: integer("cook_mins"),