bug/ Server Error when creating Confluence connector

Describe the bug

When attempting to create a Confluence source connector with minimum viable configuration, the server returns a 500 status.

To Reproduce

With HTTPie:

$ http -jv POST https://platform.unstructuredapp.io/api/v1/sources/ unstructured-api-key:$UNSTRUCTURED_API_KEY name=test-confluence-connector type=confluence config:='{"url":"https://foo.atlassian.com", "username":"foo", "password":"foo"}'

POST /api/v1/sources/ HTTP/1.1
Accept: application/json, */*;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 145
Content-Type: application/json
Host: platform.unstructuredapp.io
User-Agent: HTTPie/3.2.4
unstructured-api-key: ****

{
    "config": {
        "password": "foo",
        "url": "https://foo.atlassian.com",
        "username": "foo"
    },
    "name": "test-confluence-connector",
    "type": "confluence"
}


HTTP/1.1 500 Internal Server Error
content-length: 21
content-type: text/plain; charset=utf-8
date: Wed, 20 Aug 2025 20:59:20 GMT
server: istio-envoy
x-envoy-upstream-service-time: 277

Internal Server Error

Expected behavior

Either a validation error message or a successfully created connector.

Additional context

Documentation for the Confluence connector seems to indicate that the above request should be valid.

Reproduce the POST /api/v1/sources/ request with the minimum Confluence configuration shown, then trace the source-creation request and validation path in the Python client. Compare the request with the linked Confluence documentation; done means the request either creates the connector or returns a clear validation error instead of HTTP 500.