feat(build): optimize generateParamPrefixCombinations with root parameter support
Add rootParamKeys parameter to generateParamPrefixCombinations to ensure partial shells only include complete sets of root parameters. This prevents generating invalid partial routes missing required root parameters, improving PPR shell generation efficiency.
- Add rootParamKeys parameter to generateParamPrefixCombinations function
- Implement logic to skip partial combinations without complete root params
- Update buildAppStaticPaths to pass rootParamKeys to the function
- Add comprehensive test coverage for new functionality
- Enhance documentation with detailed examples and behavior explanations