feat: add Tailcall config generator

[rohitmulani63-ops]

Closes #373
/claim #373

Summary

I added a focused Tailcall config generator at /app/config.

What changed:

• added a new schema-driven config generator page
• loads .tailcallrc.schema.json dynamically from the generated Tailcall schema URL
• lets users search and add schema fields instead of guessing field names
• supports nested object fields, enum datalist inputs, booleans, numbers, arrays, and strings
• provides JSON and YAML output downloads
• includes a limited GraphQL preview for schema-level scalar directive values

I kept the PR intentionally small and reviewable.

Validation

• CYPRESS_INSTALL_BINARY=0 npm ci passed
• npm run build passed and generated the production static files
• git diff --check passed, with only normal Windows line-ending warnings
• checked the changed files for hidden/bidirectional control characters: clean
• npm run start -- --host 127.0.0.1 --port 3063 compiled the client successfully in local dev mode

Notes:

• npm run typecheck currently fails on existing unrelated repo issues in publish-externals, Playground.tsx, and the custom DocSearch theme files
• the production build completed with existing non-fatal dependency warnings for optional ws packages (bufferutil, utf-8-validate) and stale Browserslist data

[rohitmulani63-ops]

Hi, just checking if anything else is needed on this. I can adjust the generator docs or examples if you want any changes.

[rohitmulani63-ops]

Thanks for the update. I saw #373 and this PR were closed today. Was the config generator direction dropped, or is there a newer preferred scope? If there is a specific gap worth carrying forward, I'm happy to adapt the work.