Add libsodium static libraries to repository

- Updated .gitignore to allow libsodium .lib files
- Added all libsodium static libraries for v142 and v143 toolsets
- Fixes GitHub Actions build error: LNK1181 libsodium.lib not found
- Includes Win32 and x64 builds for Debug and Release configurations

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: r0073rr0r

.gitignore

@@ -26,6 +26,9 @@ Win32/
 *.log
 *.tlog
 
+# Exception: Keep libsodium static libraries
+!libsodium/**/*.lib
+
 # Temporary files
 *.tmp
 *.bak