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/pygments/lexers/text.py

@@ -0,0 +1,27 @@
+"""
+    pygments.lexers.text
+    ~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for non-source code file types.
+
+    :copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+# ruff: noqa: F401
+from pygments.lexers.configs import ApacheConfLexer, NginxConfLexer, \
+    SquidConfLexer, LighttpdConfLexer, IniLexer, RegeditLexer, PropertiesLexer, \
+    UnixConfigLexer
+from pygments.lexers.console import PyPyLogLexer
+from pygments.lexers.textedit import VimLexer
+from pygments.lexers.markup import BBCodeLexer, MoinWikiLexer, RstLexer, \
+    TexLexer, GroffLexer
+from pygments.lexers.installers import DebianControlLexer, DebianSourcesLexer, SourcesListLexer
+from pygments.lexers.make import MakefileLexer, BaseMakefileLexer, CMakeLexer
+from pygments.lexers.haxe import HxmlLexer
+from pygments.lexers.sgf import SmartGameFormatLexer
+from pygments.lexers.diff import DiffLexer, DarcsPatchLexer
+from pygments.lexers.data import YamlLexer
+from pygments.lexers.textfmts import IrcLogsLexer, GettextLexer, HttpLexer
+
+__all__ = []