fix: restore the deprecated issue_token aliases

Published 2.0.2 exposed ElydoraClient.issue_token(),
AsyncElydoraClient.issue_token(), and the IssueTokenResponse type alias.
The audit removed them, which breaks 2.0.x callers on a minor upgrade.
Restore all three, now raising DeprecationWarning.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

elydora/__init__.py

@@ -68,6 +68,7 @@ from .types import (
     AuthLoginResponse,
     GetMeResponse,
     IssueApiTokenResponse,
+    IssueTokenResponse,
     RotateApiTokenResponse,
     HealthResponse,
     DeepHealthResponse,
@@ -142,6 +143,7 @@ __all__ = [
     "AuthLoginResponse",
     "GetMeResponse",
     "IssueApiTokenResponse",
+    "IssueTokenResponse",
     "RotateApiTokenResponse",
     "HealthResponse",
     "DeepHealthResponse",