Introduced a new `EnvelopeReceiverJwt` authentication scheme to support per-envelope JWT validation using cookies specific to envelope keys. Added the `CheckEnvelopeReceiver` endpoint in `AuthController.cs` to validate these tokens, protected by the `AuthPolicy.Receiver` policy.
Configured the `EnvelopeReceiverJwt` scheme to dynamically resolve issuer signing keys and validate tokens. Enhanced `JwtBearerEvents.OnMessageReceived` to extract envelope keys from the request path and retrieve tokens from corresponding cookies.
Updated the `AuthPolicy.Receiver` policy to use the `EnvelopeReceiverJwt` scheme, ensuring isolated authentication for per-envelope scenarios. Added XML documentation for the `CheckEnvelopeReceiver` method.
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