handlers/api.rs (1706 LOC) + html.rs (1735 LOC) → 12 domain files: auth, diary, movies, users, search, watchlist, goals, social, integrations, helpers + existing import/webhook/wrapup/images/rss. domain/testing.rs (1309 LOC) → testing/ module: in_memory, fakes, noops, panics, wrapup. Update README + architecture.mmd with goals feature.
Add ProfileFieldDto and UpdateProfileFieldsRequest to api-types, annotate update_profile_fields_handler with utoipa::path, register in UsersDoc. Coverage now 100%.
