Fix duplicates v1 txt records

[chdwlch]

• Removed DO code
• Added a step to check for an existing record via CloudFlare API before attempting to create the record
• Returns a 409 in the creation attempt instead of 400 if a duplicate is found at that point Resolves: https://github.com/ATLBitLab/twelvecash/issues/6, https://github.com/ATLBitLab/twelvecash/issues/13

# create bip353
curl -X POST http://localhost:3000/record -H "Content-Type: application/json" -d  '{"localPart": "cw-test-72", "bolt12": "lno....1234567890"}'
{"message":"Bolt12 Address Created"

# duplicate with same values
curl -X POST http://localhost:3000/record -H "Content-Type: application/json" -d  '{"localPart": "cw-test-72", "bolt12": "lno....1234567890"}'
{"message":"Name is already taken."}

# duplicate with different values
curl -X POST http://localhost:3000/record -H "Content-Type: application/json" -d  '{"localPart": "cw-test-72", "bolt12": "lno....12345678901"}'
{"message":"Name is already taken."}

[netlify[bot]]

✅ Deploy Preview for twelvecash ready!

Name	Link
🔨 Latest commit	4efb32d0431088d67655dbf2216e60148cc8c299
🔍 Latest deploy log	https://app.netlify.com/sites/twelvecash/deploys/669697b72fe970000885b8a6
😎 Deploy Preview	https://deploy-preview-24--twelvecash.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.