feat: per-baby breastfeeding and pump feature toggles

Add isBreastfed and hasPump flags to Baby model. When disabled,
hide breastfeeding/pump options from quick-add FAB, dashboard
counters and quick-log groups, and the milk stock nav link.
Settings page gains toggle UI to configure per baby.

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

prisma/migrations/20260619092758_add_feeding_flags/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "Baby" ADD COLUMN     "hasPump" BOOLEAN NOT NULL DEFAULT true,
+ADD COLUMN     "isBreastfed" BOOLEAN NOT NULL DEFAULT true;

prisma/schema.prisma

@@ -149,7 +149,9 @@ model Baby {
   id          String       @id @default(cuid())
   name        String
   birthDate   DateTime
-  gender      String?
+  gender       String?
+  isBreastfed  Boolean  @default(true)
+  hasPump      Boolean  @default(true)
   familyId    String
   family      Family       @relation(fields: [familyId], references: [id])
   events      Event[]