created different models

lib/src/enums.dart

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+enum System { metric, imperial, neutral }
+
+enum UnitType {
+  fluid,
+  weight,
+  count,
+}
+
+enum Difficulty {
+  notSelected,
+  veryEasy,
+  easy,
+  intermediate,
+  hard,
+  veryHard,
+}
+
+enum IngredientType {
+  vegetable,
+  meat,
+  fish,
+  grain,
+  fruit,
+  dairy,
+  fatsAndOil,
+  spice,
+  other,
+}
+
+enum MealCategory {
+  // Main Meals
+  breakfast,
+  brunch,
+  lunch,
+  dinner,
+  supper,
+
+  // Other Categories
+  dessert,
+  snack,
+  appetizer,
+  sideDish,
+  beverage
+}
+
+enum Cuisine {
+  // Asian Cuisines
+  chinese,
+  japanese,
+  korean,
+  vietnamese,
+  thai,
+  indian,
+  indonesian,
+  malaysian,
+  filipino,
+  singaporean,
+
+  // European Cuisines
+  french,
+  italian,
+  spanish,
+  greek,
+  german,
+  british,
+  irish,
+  polish,
+  hungarian,
+  swedish,
+  norwegian,
+  danish,
+  portuguese,
+  belgian,
+  dutch,
+  swiss,
+
+  // Middle Eastern Cuisines
+  turkish,
+  lebanese,
+  persian,
+  israeli,
+  moroccan,
+  egyptian,
+
+  // American Cuisines
+  american,
+  mexican,
+  brazilian,
+  argentinian,
+  peruvian,
+  caribbean,
+  cajun,
+  creole,
+  texMex,
+  canadian,
+
+  // African Cuisines
+  ethiopian,
+  nigerian,
+  southAfrican,
+  kenyan,
+  tunisian,
+
+  // Pacific & Oceanian
+  australian,
+  newZealand,
+  hawaiian,
+  polynesian,
+
+  // Regional American
+  southernUs,
+  newEngland,
+  midwestern,
+  southwestern,
+  california,
+
+  // Fusion
+  asianFusion,
+  latinFusion,
+  mediterranean,
+  panAsian,
+
+  // Other
+  international,
+  modern,
+  fusion,
+  streetFood
+}