Add sitemap and robots TS files

[google-labs-jules]

This PR adds and configures sitemap.ts and robots.ts files in the Next.js App Router to handle SEO requirements.

Changes:

• Created src/app/robots.ts to generate robots.txt, allowing all crawlers and pointing to the sitemap.
• Updated src/app/sitemap.ts to include the current homepage route and removed non-existent placeholder routes (/python, /typescript).
• Both files use export const dynamic = "force-static"; to ensure they are correctly generated as static assets during the next build process, which is necessary because the project is configured with output: "export".

Verification:

• Ran pnpm build and verified that out/sitemap.xml and out/robots.txt are correctly generated.
• Ran pnpm lint, pnpm run typecheck, and pnpm test to ensure project integrity.

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PR created automatically by Jules for task 2994241262552394057 started by @amrabed

[google-labs-jules]

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