build: add TypeScript configuration and generate declaration files

- Add tsconfig.json for TypeScript compilation with declaration and source map generation
- Generate .d.ts declaration files for all modules, services, controllers, and models
- Update package.json with NestJS dependencies and TypeScript development tools
- Include database files in the distribution output for persistence

src/models/food-item.model.ts

@@ -0,0 +1,63 @@
+import { Column, Model, Table, HasMany, DataType } from 'sequelize-typescript';
+import { MealFood } from './meal-food.model';
+import { PlannedFood } from './planned-food.model';
+
+@Table
+export class FoodItem extends Model {
+  @Column({ allowNull: false })
+  name: string;
+
+  @Column
+  name_tagalog: string;
+
+  @Column
+  category: string;
+
+  @Column({ type: DataType.FLOAT, allowNull: false })
+  calories: number;
+
+  @Column({ type: DataType.FLOAT, defaultValue: 0 })
+  protein_g: number;
+
+  @Column({ type: DataType.FLOAT, defaultValue: 0 })
+  carbs_g: number;
+
+  @Column({ type: DataType.FLOAT, defaultValue: 0 })
+  fat_g: number;
+
+  @Column({ type: DataType.FLOAT, defaultValue: 0 })
+  fiber_g: number;
+
+  @Column({ type: DataType.FLOAT, defaultValue: 0 })
+  sugar_g: number;
+
+  @Column({ type: DataType.FLOAT, defaultValue: 0 })
+  sodium_mg: number;
+
+  @Column({ type: DataType.FLOAT, defaultValue: 100 })
+  serving_size_g: number;
+
+  @Column
+  serving_description: string;
+
+  @Column({ defaultValue: 'manual' })
+  source: string;
+
+  @Column({ defaultValue: false })
+  is_filipino: boolean;
+
+  @Column({ defaultValue: false })
+  is_favorite: boolean;
+
+  @Column(DataType.TEXT)
+  api_data: string;
+
+  @Column({ defaultValue: DataType.NOW })
+  last_updated: Date;
+
+  @HasMany(() => MealFood)
+  mealFoods: MealFood[];
+
+  @HasMany(() => PlannedFood)
+  plannedFoods: PlannedFood[];
+}