Install OpenAI SDK and add utility module for AI integration

[Copilot]

This PR adds the OpenAI SDK to the project to enable AI-powered features throughout the website.

Changes Made

1. OpenAI SDK Installation

• Added openai: ^5.19.1 to package.json dependencies
• Updated package-lock.json with the new dependency

2. Utility Module

Created src/lib/openai.ts with:

• Pre-configured OpenAI client instance that reads from OPENAI_API_KEY environment variable
• Example generateText() function demonstrating proper usage with error handling
• TypeScript types and JSDoc documentation

3. Environment Configuration

• Added OPENAI_API_KEY="" to .env.example to document the required environment variable

Usage Example

import { generateText, openai } from '@/lib/openai';

// Simple text generation
const response = await generateText("Write a brief product description");

// Direct client usage for more complex scenarios
const completion = await openai.chat.completions.create({
  model: 'gpt-4',
  messages: [{ role: 'user', content: 'Hello!' }],
});

Setup Required

To use the OpenAI features, developers need to:

1. Copy .env.example to .env.local
2. Add their OpenAI API key: OPENAI_API_KEY=sk-...

The integration is ready for use across the Next.js application and follows TypeScript best practices with proper error handling.

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