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/meals/nutrition.service.d.ts

@@ -0,0 +1,52 @@
+import { ConfigService } from '@nestjs/config';
+import { FoodItem } from '../models/food-item.model';
+import { APICache } from '../models/api-cache.model';
+export declare class NutritionService {
+    private configService;
+    private foodItemModel;
+    private apiCacheModel;
+    private apiKey;
+    private baseUrl;
+    private headers;
+    private cacheDurationDays;
+    constructor(configService: ConfigService, foodItemModel: typeof FoodItem, apiCacheModel: typeof APICache);
+    searchFood(query: string): Promise<{
+        name: any;
+        calories: any;
+        protein_g: any;
+        carbs_g: any;
+        fat_g: any;
+        fiber_g: any;
+        sugar_g: any;
+        sodium_mg: any;
+        serving_size_g: any;
+        source: string;
+    }[]>;
+    _getFromCache(query: string): Promise<{
+        name: any;
+        calories: any;
+        protein_g: any;
+        carbs_g: any;
+        fat_g: any;
+        fiber_g: any;
+        sugar_g: any;
+        sodium_mg: any;
+        serving_size_g: any;
+        source: string;
+    }[]>;
+    _saveToCache(query: string, source: string, data: any): Promise<void>;
+    _parseApiResponse(data: any[]): {
+        name: any;
+        calories: any;
+        protein_g: any;
+        carbs_g: any;
+        fat_g: any;
+        fiber_g: any;
+        sugar_g: any;
+        sodium_mg: any;
+        serving_size_g: any;
+        source: string;
+    }[];
+    saveFoodToDb(foodData: any): Promise<FoodItem>;
+    searchAllSources(query: string): Promise<any[]>;
+}