chore: 添加虚拟环境到仓库

- 添加 backend_service/venv 虚拟环境
- 包含所有Python依赖包
- 注意：虚拟环境约393MB，包含12655个文件

backend_service/venv/lib/python3.13/site-packages/pyasn1_modules/rfc8708.py

@@ -0,0 +1,41 @@
+# This file is being contributed to pyasn1-modules software.
+#
+# Created by Russ Housley
+#
+# Copyright (c) 2020, Vigil Security, LLC
+# License: http://snmplabs.com/pyasn1/license.html
+#
+# HSS/LMS Hash-based Signature Algorithm for CMS
+#
+# ASN.1 source from:
+# https://www.rfc-editor.org/rfc/rfc8708.txt
+
+
+from pyasn1.type import univ
+
+from pyasn1_modules import rfc5280
+
+
+# Object Identifiers
+
+id_alg_hss_lms_hashsig = univ.ObjectIdentifier('1.2.840.113549.1.9.16.3.17')
+
+id_alg_mts_hashsig = id_alg_hss_lms_hashsig
+
+
+# Signature Algorithm Identifier
+
+sa_HSS_LMS_HashSig = rfc5280.AlgorithmIdentifier()
+sa_HSS_LMS_HashSig['algorithm'] = id_alg_hss_lms_hashsig
+# sa_HSS_LMS_HashSig['parameters'] is alway absent
+
+
+# Public Key
+
+class HSS_LMS_HashSig_PublicKey(univ.OctetString):
+    pass
+
+
+pk_HSS_LMS_HashSig = rfc5280.SubjectPublicKeyInfo()
+pk_HSS_LMS_HashSig['algorithm'] = sa_HSS_LMS_HashSig
+# pk_HSS_LMS_HashSig['parameters'] CONTAINS a DER-encoded HSS_LMS_HashSig_PublicKey