chore: add .gitignore for test files and build artifacts

Author: rz467fzs7d

.gitignore

@@ -0,0 +1,21 @@
+# macOS
+.DS_Store
+
+# Build artifacts
+*.ipk
+
+# Development and testing files
+BUILD_IPK.md
+TESTING.md
+build-*.sh
+deploy-*.sh
+rollback-*.sh
+
+# Documentation and planning
+subscription-from-proxy-providers-plan*.md
+
+# Test configuration
+test-config-*.yaml
+
+# Test directory
+test/