Add TypeScript model generation for Pet Shop API

[pditommaso]

Summary

• Add TypeScript model generation using OpenAPI Generator
• Mirror Java model generation pattern: logic in app subproject, output in api directory
• Generate type-safe TypeScript interfaces for all API models

Changes

• Build Configuration: Add OpenAPI Generator plugin to app/build.gradle
• Generation Task: Create generateTypeScriptModels task that depends on OpenAPI spec generation
• Output Location: TypeScript models generated in api/typescript/ directory
• Convenience Import: Create index.ts for easy model imports

Generated Models

• Pet - Complete pet model with validation and date handling
• CreatePetRequest/Response - Pet creation interfaces
• UpdatePetRequest/Response - Pet update interfaces
• GetPetResponse - Single pet retrieval
• ListPetsResponse - Multiple pets response
• ErrorResponse - Error handling model
• ServiceInfo/Response - Service metadata models

Usage

import { Pet, CreatePetRequest, ErrorResponse } from 'api/typescript';

const newPet: CreatePetRequest = {
  name: 'Buddy',
  species: 'dog', 
  age: 3,
  breed: 'Golden Retriever' // optional
};

Generation Command

./gradlew :app:generateTypeScriptModels

[pditommaso]

Tagging @alvaromartmart for visibility