Add bblbb mail provider and CPA push queue; sync runtime artifacts.

Switch default email provider to mail.bblbb.com, queue failed CPA auth pushes for retry, and refresh local auth/account outputs.

cpa/__init__.py

@@ -1,6 +1,14 @@
 """CPA (CLIProxyAPI) xai auth 组装 / 写盘 / 推送远端。"""
 
 from .client import CpaPushError, push_auth_file
+from .push_queue import (
+    PENDING_NAME,
+    flush_push_pending,
+    load_pending,
+    push_with_queue,
+    record_push_failure,
+    remove_push_pending,
+)
 from .schema import (
     API_BASE_URL,
     CLI_BASE_URL,
@@ -25,12 +33,18 @@ __all__ = [
     "DEFAULT_HEADERS",
     "GROK_TOKEN_UA",
     "GROK_VERSION",
+    "PENDING_NAME",
     "REDIRECT_URI",
     "TOKEN_ENDPOINT",
     "CpaPushError",
     "build_cpa_xai_auth",
     "credential_file_name",
     "expired_from_access_token",
+    "flush_push_pending",
+    "load_pending",
     "push_auth_file",
+    "push_with_queue",
+    "record_push_failure",
+    "remove_push_pending",
     "write_cpa_xai_auth",
 ]