chore: 添加.gitattributes规范行尾符处理

- 设置text=auto自动检测文本文件
- 为常见源代码文件指定LF行尾符
- 解决Windows/WSL环境切换时的行尾符差异问题

.gitattributes

@@ -0,0 +1,39 @@
+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Explicitly declare text files
+*.rs text eol=lf
+*.py text eol=lf
+*.md text eol=lf
+*.toml text eol=lf
+*.json text eol=lf
+*.yml text eol=lf
+*.yaml text eol=lf
+
+# Declare files that will always have CRLF line endings on checkout
+*.sln text eol=crlf
+
+# Denote all files that are truly binary and should not be modified
+*.png binary
+*.jpg binary
+*.gif binary
+*.ico binary
+*.mov binary
+*.mp4 binary
+*.mp3 binary
+*.flv binary
+*.flac binary
+*.jar binary
+*.war binary
+*.nar binary
+*.ear binary
+*.zip binary
+*.tar binary
+*.gz binary
+*.xz binary
+*.bz2 binary
+*.7z binary
+*.pdf binary
+*.docx binary
+*.xlsx binary
+*.pptx binary