Improve Copper Detector verification with stricter status code and email matching

[amanfcp]

Description:

• Switch from POST /tasks/search to GET /users/me endpoint for better reliability
• Add strict email verification comparing API response against credentials
• Refactor verification logic into verifyCopper() helper function
• Properly cleanup response bodies to avoid resource leaks

Checklist:

• Tests passing (make test-community)?
• Lint passing (make lint this requires golangci-lint)?

[camgunz]

Looks good; gonna check before we merge this in though, so let's hold off on merging until then.

[kashifkhan0771]

Now we talking 🚀

If it still breaks - I am gonna 😠