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/styles/rrt.py

@@ -0,0 +1,40 @@
+"""
+    pygments.styles.rrt
+    ~~~~~~~~~~~~~~~~~~~
+
+    pygments "rrt" theme, based on Zap and Emacs defaults.
+
+    :copyright: Copyright 2006-2025 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.style import Style
+from pygments.token import Token, Comment, Name, Keyword, String, Number, Operator
+
+
+__all__ = ['RrtStyle']
+
+
+class RrtStyle(Style):
+    """
+    Minimalistic "rrt" theme, based on Zap and Emacs defaults.
+    """
+
+    name = 'rrt'
+
+    background_color = '#000000'
+    highlight_color = '#0000ff'
+
+    styles = {
+        Token:              '#dddddd',
+        Comment:            '#00ff00',
+        Name.Function:      '#ffff00',
+        Name.Variable:      '#eedd82',
+        Name.Constant:      '#7fffd4',
+        Keyword:            '#ff0000',
+	Operator.Word:      '#ff0000',
+        Comment.Preproc:    '#e5e5e5',
+        String:             '#87ceeb',
+        Keyword.Type:       '#ee82ee',
+        Number:             '#ff00ff',
+    }