feat: Improve multi-language scenario support, optimize CNB version detection and startup parameter configuration

[zzzhangqi]

Core Optimizations

1. Composite Language Recognition - Enhanced GetCNBVersions function to support parsing composite language formats (e.g., "dockerfile,Node.js") by checking each language component
2. Multi-language Scene Handling - Optimized language detection logic in SourceCodeParse:
   • Improved static/dynamic runtime type judgment to support scenarios with multiple language labels
   • Optimized default port configuration logic to ensure correct port settings in multi-language scenarios
   • Adjusted startup parameter judgment conditions to ensure CNB-built images get appropriate startup parameters
3. New Test Coverage - Added two new test files:
   • cnb_versions_test.go - Tests composite language version detection functionality
   • source_code_args_test.go - Tests startup parameter acquisition logic

Technical Details

• Previously only supporting single language judgment, now handles multi-language scenarios using strings.Split and strings.TrimSpace
• Maintains backward compatibility with existing language formats
• Optimized logic works for projects containing both Dockerfile and Node.js

These changes will significantly enhance Rainbond's build and deployment experience when handling complex multi-language applications.