fix: convert all shell scripts to LF line endings for Linux/WSL compatibility

- Convert all .sh files from CRLF to LF line endings
- Add .gitattributes to enforce LF for shell scripts
- Fix "bash\r: No such file or directory" error in WSL environments

This resolves the installation failure on WSL/Linux systems where
Windows CRLF line endings cause shell scripts to fail.

Related to #1

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,32 @@
+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Shell scripts must use LF line endings (Unix style)
+*.sh text eol=lf
+
+# Batch/PowerShell scripts can use CRLF (Windows style)
+*.bat text eol=crlf
+*.cmd text eol=crlf
+*.ps1 text eol=crlf
+
+# Python scripts should use LF
+*.py text eol=lf
+
+# Common text files
+*.md text
+*.txt text
+*.json text
+*.yaml text
+*.yml text
+*.toml text
+
+# Binary files (no line ending conversion)
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.zip binary
+*.tar binary
+*.gz binary
+*.pdf binary