fix: echo route syntax uses :id not {id}

[overthink]

If you run the echo example with go run adapter/echoopenapi/examples/basic/main.go, prior to this patch you'd get a 404 from:

curl --request POST \
  --url http://localhost:3000/api/v1/login \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/json' \
  --data '{
  "password": "foo",
  "username": "bar"
}'

With this fix you get a response.

However, the fixed response reveals a deeper issue: in Echo you sepcify path params with the param struct tag, not path. So The above request now returns {"id":"","name":"John Doe"} but we expect {"id":"123","name":"John Doe"}. I'll raise this separately in an issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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