Add veteran status verification

[jeromehardaway]

Add API route and frontend form for Veteran Confirmation API integration.

• API Route: Create veteran-status.ts in pages/api directory to handle POST requests, extract firstName, lastName, birthDate, and ssn from the request body, send a POST request to the Veteran Confirmation API, include the API key from environment variables in the request headers, and return the API response as JSON or an error message.
• Frontend Form: Create VeteranStatus.tsx in pages directory to display a form with fields for firstName, lastName, birthDate, and ssn, send the form data to the veteran-status API route via a POST request when submitted, and display the API response or an error message to the user.
• Environment Variable: Add .env.local file to store the VA_API_KEY environment variable securely.

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