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/foods/foods.service.d.ts

@@ -0,0 +1,12 @@
+import { FoodItem } from '../models/food-item.model';
+export declare class FoodsService {
+    private foodItemModel;
+    constructor(foodItemModel: typeof FoodItem);
+    getFoods(category?: string, searchQuery?: string): Promise<{
+        filipino_foods: FoodItem[];
+        other_foods: FoodItem[];
+        categories: string[];
+        current_category: string;
+        search_query: string;
+    }>;
+}