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/auth/auth.service.d.ts

@@ -0,0 +1,6 @@
+import { UsersService } from '../users/users.service';
+export declare class AuthService {
+    private usersService;
+    constructor(usersService: UsersService);
+    validateUser(username: string, pass: string): Promise<any>;
+}