Remove .saac/ directory from repository and add to .gitignore

- Add .saac/ to .gitignore (local SAAC configuration)
- Remove .saac/config.json from git tracking
- This file is generated locally and should not be in templates

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

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

.gitignore

@@ -3,3 +3,4 @@ npm-debug.log
 .env
 .DS_Store
 *.log
+.saac/