Fix legacy issues in create-qiankun cli

[kuitos]

This PR addresses various code quality, stability, and user experience issues in the create-qiankun CLI tool.

Key improvements include:

• Enhanced Error Handling & Input Validation: Added robust try-catch blocks and input validation (e.g., project name, port numbers) across core functions.
• Improved Port Generation: Rewrote the port generation algorithm to prevent conflicts, exclude common/system ports, and ensure availability.
• Refactored Logic: Optimized template rendering, script injection, and Qiankun configuration injection for better robustness and clarity.
• Utility Function Enhancements: Improved Git initialization (checks for existing repo), directory traversal (skips hidden files), and path normalization.
• Code Redundancy: Removed duplicate scripts definitions in the React18 main application template.
• User Experience: Improved error messages and logging for clearer feedback.
• close https://github.com/umijs/qiankun/ISSUE_URL

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Name	Status	Preview	Comments	Updated (UTC)
qiankun	❌ Failed (Inspect)			Jul 16, 2025 9:08am

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Latest commit: d3cf181

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