chore: update gitignore

Author: mostafa-wahied

.gitignore

@@ -12,6 +12,10 @@ backend/data/*.db
 backend/data/*.json
 backend/data/*.md
 
+# Test results and API testing artifacts
+backend/api-tests/
+backend/api-docs/
+
 # Ignore OS specific files and common editor/IDE directories
 .DS_Store
 Thumbs.db