refactor(auth): consolidate the auth-source secret lookup into one helper

The auth-source-search + funcall-the-secret block was copied four times: calendar-sync--calendar-url, cj/auth-source-secret (ai-config), cj/--auth-source-password (transcription), and cj/slack--get-credential. Each searched authinfo, pulled :secret, and called it when the netrc backend returned a function.

I pulled that into cj/auth-source-secret-value in system-lib (a leaf, so calendar-sync doesn't have to depend on ai-config and drag in the gptel stack). It takes an optional user and returns the secret or nil. The four callers now delegate to it: ai-config layers its required-secret error on top, and the others keep their nil-on-miss behavior. With the direct auth-source-search calls gone, I dropped the now-unused (require 'auth-source) from transcription, slack, and calendar-sync. The helper's autoload covers it.

The transcription tests that exercise the delegated path stay green, and the primitive and the error wrapper get their own tests.

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