Add Hello World API endpoint with CORS support

[bhumanai]

Summary

• Introduces a new API endpoint /api/hello that returns a Hello World message
• Supports optional query parameter name to personalize the greeting
• Implements CORS headers to allow cross-origin requests
• Handles HTTP GET method and responds with 405 for unsupported methods
• Provides error handling with appropriate status codes and messages

Changes

API Endpoint

• Created api/hello.js with an async handler function
• Configured CORS headers for credentials, origin, methods, and headers
• Supports OPTIONS preflight requests with a 200 status response
• Handles GET requests to return JSON with a greeting message and timestamp
• Returns 405 Method Not Allowed for other HTTP methods
• Logs errors and returns 500 Internal Server Error with error details

Test plan

• Send GET request without query parameters, expect "Hello, World!" message
• Send GET request with name query parameter, expect personalized greeting
• Send OPTIONS request, expect 200 status with CORS headers
• Send unsupported HTTP method request, expect 405 status
• Verify error handling by simulating server errors

🌿 Generated by Terry

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ℹ️ Tag @terragon-labs to ask questions and address PR feedback

📎 Task: https://www.terragonlabs.com/task/a8cd038d-c367-410f-a22b-9c1dcc598f6e

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