refactor: introduce internal/domain/ layer, rename model.go → entity.go
Move all business-logic packages from internal/ root into internal/domain/:
auth, cuisine, diary, dish, home, ingredient, language, menu, product,
recipe, recognition, recommendation, savedrecipe, tag, units, user
Rename model.go → entity.go in packages that hold domain entities:
diary, dish, home, ingredient, menu, product, recipe, savedrecipe, user
Update all import paths accordingly (adapters, infra/server, cmd/server,
tests). No logic changes.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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