[fit2cloud-chenyw]

CAS callback validation could report both success and failure for the same valid input. Return immediately after successful validation so existing callback values, including root URLs with or without a trailing slash, can be submitted consistently.

Clarify in all five languages that a successful connection check confirms login endpoint reachability; callback and account validation still require an actual sign-in.

Validation:

• Five Playwright cases passed using the real CAS editor with isolated HTTP boundaries; the duplicate-callback case fails against the original component.
• Frontend type checking and production build passed on the latest main baseline.
• Related xpack URL handling and historical service compatibility changes are committed separately in xpack main, version 0.0.5.42; its 36 backend regressions passed. The wheel has not been published.
• Customer CAS sign-in and persistence are not covered by the component fixture.

[fit2cloud-chenyw]

LGTM