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/database/database.module.ts

@@ -0,0 +1,44 @@
+import { Module } from '@nestjs/common';
+import { SequelizeModule } from '@nestjs/sequelize';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { User } from '../models/user.model';
+import { FoodItem } from '../models/food-item.model';
+import { Meal } from '../models/meal.model';
+import { MealFood } from '../models/meal-food.model';
+import { WaterLog } from '../models/water-log.model';
+import { WeightLog } from '../models/weight-log.model';
+import { MealPlan } from '../models/meal-plan.model';
+import { PlannedFood } from '../models/planned-food.model';
+import { UserGoal } from '../models/user-goal.model';
+import { DailySummary } from '../models/daily-summary.model';
+import { APICache } from '../models/api-cache.model';
+
+@Module({
+  imports: [
+    SequelizeModule.forRootAsync({
+      imports: [ConfigModule],
+      useFactory: (configService: ConfigService) => ({
+        dialect: 'sqlite',
+        storage: configService.get<string>('DATABASE_URL') ? configService.get<string>('DATABASE_URL').replace('sqlite://', '') : 'data/calorie_tracker.db',
+        models: [
+          User,
+          FoodItem,
+          Meal,
+          MealFood,
+          WaterLog,
+          WeightLog,
+          MealPlan,
+          PlannedFood,
+          UserGoal,
+          DailySummary,
+          APICache,
+        ],
+        autoLoadModels: true,
+        synchronize: true,
+        logging: false,
+      }),
+      inject: [ConfigService],
+    }),
+  ],
+})
+export class DatabaseModule {}