CVE-2026-54635: pytonapi has a Webhook Custom Path Authentication Bypass

TonapiWebhookDispatcher in pytonapi 2.2.0 fails to validate the Authorization header when a webhook handler is registered with the documented path= argument. During setup(), bearer tokens are stored only under the default suffix paths (e.g., /hook/account-tx), but the custom path (e.g., /hook/custom) is never added to the token map. When an incoming request arrives at the custom path, self._tokens.get(path) returns None, causing the if expected_token is not None guard to evaluate to False and silently skip authentication entirely. An unauthenticated remote attacker can POST arbitrary forged payloads to the custom webhook endpoint and trigger victim-defined handlers with full integrity impact.