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

dist/models/meal-plan.model.d.ts

@@ -0,0 +1,12 @@
+import { Model } from 'sequelize-typescript';
+import { User } from './user.model';
+import { PlannedFood } from './planned-food.model';
+export declare class MealPlan extends Model {
+    UserId: number;
+    user: User;
+    date: Date;
+    meal_type: string;
+    is_completed: boolean;
+    notes: string;
+    plannedFoods: PlannedFood[];
+}