Regression test for #2599. Exercises getProviderFromMap with native
bools and with stringified booleans ("true"/"false"/"1"/"0") for all
four boolean provider fields — emailfallback, usernamefallback,
forceuserinfo, requireavailability. From env vars and from the
GetConfigValueFromFile path every leaf arrives as a string, so the
current .(bool) assertion silently zeros these fields.
Detect when two configured OIDC providers resolve to the same issuer URL
at startup and halt with a fatal error, preventing team sync data
corruption caused by ambiguous (external_id, issuer) matching.
Also adds duplicate issuer detection to the doctor service diagnostics
and comprehensive tests with mock OIDC discovery servers.
kolaente
Claude
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