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/procfile.py

@@ -0,0 +1,41 @@
+"""
+    pygments.lexers.procfile
+    ~~~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexer for Procfile file format.
+
+    :copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, bygroups
+from pygments.token import Name, Number, String, Text, Punctuation
+
+__all__ = ["ProcfileLexer"]
+
+
+class ProcfileLexer(RegexLexer):
+    """
+    Lexer for Procfile file format.
+
+    The format is used to run processes on Heroku or is used by Foreman or
+    Honcho tools.
+    """
+    name = 'Procfile'
+    url = 'https://devcenter.heroku.com/articles/procfile#procfile-format'
+    aliases = ['procfile']
+    filenames = ['Procfile']
+    version_added = '2.10'
+
+    tokens = {
+        'root': [
+            (r'^([a-z]+)(:)', bygroups(Name.Label, Punctuation)),
+            (r'\s+', Text.Whitespace),
+            (r'"[^"]*"', String),
+            (r"'[^']*'", String),
+            (r'[0-9]+', Number.Integer),
+            (r'\$[a-zA-Z_][\w]*', Name.Variable),
+            (r'(\w+)(=)(\w+)', bygroups(Name.Variable, Punctuation, String)),
+            (r'([\w\-\./]+)', Text),
+        ],
+    }