Change ruleRecommendations property to resourceRecommendations

[chriscarrollsmith]

Make sure to keep backward compatibility

[chriscarrollsmith]

The motivation here is that while "rule" makes sense for Cline and Cursor users, it won't make sense on other clients. Also, there might be lots of other kinds of resources we want to recommend, including documentation files to review, websites to visit, prompts to use, etc.