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.

Tái hiện request POST /api/v1/sources/ với cấu hình Confluence tối thiểu được hiển thị, sau đó lần theo đường đi của request tạo source và validation trong Python client. So sánh request với tài liệu Confluence được liên kết; được xem là hoàn thành khi request либо tạo connector hoặc trả về lỗi validation rõ ràng thay vì HTTP 500.