The API-key connection transport could present a key as a Bearer token,
an x-api-key header, a custom scheme (SSWS/Token), or HTTP Basic with an
empty password (Cursor). None of these can carry a real password, which
providers such as ClickHouse Cloud (keyId:keySecret) and Langfuse
(publicKey:secretKey) require.
Add a fourth mode, APIKeyBasicAuthUserPass, that base64-encodes the
stored "username:password" credential verbatim into Authorization: Basic.
SetBasicAuth cannot express this -- it re-appends a ":" and corrupts the
credential. The mode is wired generically through the registry and the
create-connector resolver and is mutually exclusive with the other
API-key auth modes.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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