Add ad platforms integration example

[Lokeninfinitypoint]

This example demonstrates how to integrate multiple advertising and payment platforms into a Next.js application using a unified API client.

Features:

• AI content generation (Claude/OpenAI)
• Google Ads campaign management
• Meta Ads (Facebook/Instagram) integration
• Stripe payment processing

The API client provides a clean, consistent interface for all platforms with proper error handling and TypeScript support.

[nextjs-bot]

Allow CI Workflow Run

• [ ] approve CI run for commit: f863cb88465991a2290c2212644063d6dec45e19

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[nextjs-bot]

Allow CI Workflow Run

• [ ] approve CI run for commit: 3513c1d6eead44713e187bff1b80680666b972f8

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer