* fix(voice-call): pin Twilio webhook verification to the configured public path
buildTwilioVerificationUrl overwrote the configured publicUrl path with the
incoming request path, so behind a path-rewriting reverse proxy the
reconstructed verification URL no longer matched the URL Twilio signed and
valid webhooks were rejected. Use the configured public path (keep the request
query), mirroring the Plivo sibling fixed in #112559. Restores callback-path
binding and adds proxy-prefix accept + local-path reject regression tests.
* fix(voice-call): pin Twilio verification to public URL path
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Co-authored-by: Vincent Koc <vincentkoc@ieee.org>
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