* fix(elevenlabs): fall back to default base URL when config value is malformed
* fix(elevenlabs): reject malformed and non-http(s) base URL overrides
* fix(elevenlabs): redact configured URL from base URL validation errors
* fix(elevenlabs): preserve realtime WebSocket overrides
* test(elevenlabs): avoid stale realtime test overlap
* style(elevenlabs): format realtime URL assertion
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Co-authored-by: Peter Steinberger <steipete@gmail.com>