Enable RSC support in Pro initializer

Add the three RSC fields per the marketplace demo initializer
(react-on-rails-demo-marketplace-rsc/config/initializers/
react_on_rails_pro.rb):

- enable_rsc_support = true
- rsc_bundle_js_file = "rsc-bundle.js"
- rsc_payload_generation_url_path = "rsc_payload/"

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ihabadham

config/initializers/react_on_rails_pro.rb

@@ -16,4 +16,8 @@
   # so a blank env var (.env.example ships with `RENDERER_PASSWORD=`)
   # falls back to the dev default, matching the JS side's `||`.
   config.renderer_password = ENV["RENDERER_PASSWORD"].presence || "local-dev-renderer-password"
+
+  config.enable_rsc_support = true
+  config.rsc_bundle_js_file = "rsc-bundle.js"
+  config.rsc_payload_generation_url_path = "rsc_payload/"
 end