fix: Eli2 134/make npm create eliza and npx elizaos create functionally identical

[yungalgo]

Enhanced Command-Line Handling for create-eliza

This PR improves the user experience of the create-eliza CLI tool with comprehensive flag handling and path detection:

1. Robust Flag and Argument Processing

• Properly handles all supported flags: -d/--dir, -t/--type, and -y/--yes
• Ensures flags are correctly passed to the underlying CLI regardless of position
• Preserves flag functionality when using both npm and npx command forms

2. Intelligent Directory Path Detection

• Added smart path detection to recognize various directory path formats
• Now correctly handles directory names with or without path separators
• Supports multiple command syntax patterns:
• Standard flag usage: npm create eliza -d ./my-dir
• Auto-detected paths: npm create eliza ./my-dir or npm create eliza my-project-dir
• Combined with type: npm create eliza plugin ./plugins-dir/my-plugin

3. Consistent Help Command Experience

• Added a dedicated help command that works with npm: npm create eliza help
• Help output matches exactly what users see with npx elizaos create --help
• Welcome message only appears when creating projects, not when viewing help

These changes standardize the CLI experience across npm and npx command forms, making it more intuitive and aligned with user expectations. Any command that works with npx elizaos create now works consistently with npm create eliza, providing a seamless developer experience.

[coderabbitai]

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