feat: add Playwright support for browser automation in plugins

- Updated .dockerignore and .gitignore to exclude Playwright-related files.
- Added Playwright-Go dependency in go.mod and updated go.sum.
- Implemented jsPlaywright function in js_api.go for browser-based requests.
- Enhanced README.md to document the new Playwright functionality for plugins.

.dockerignore

@@ -9,3 +9,4 @@ cache/
 docs/
 config.example.toml
 docker-compose.*
+playwright/