Change --stats to generate statistics for last 10 versions instead of 5

[Copilot]

Updated the rolldown version override tool to collect statistics for the last 10 stable versions from npm instead of the previous 5 versions, providing more comprehensive version analysis.

Changes Made

• Modified fetchStableVersions() function: Changed from fetching last 5 versions to last 10 versions
• Updated documentation: Changed function comments and console output to reflect "last 10" instead of "last 5"
• Updated help text: Changed version index range from (1-5) to (1-10) in help output
• Updated README.md: Modified feature description to reflect the expanded version coverage

Before vs After

Before:

🟢 Stable versions (last 5 from npm):
  1. 7.1.0 
  2. 7.1.1 
  3. 7.1.2 
  4. 7.1.3 
  5. 7.1.4 (current)

After:

🟢 Stable versions (last 10 from npm):
  1. 7.0.8 
  2. 7.0.9 
  3. 7.0.10 
  4. 7.0.11 
  5. 7.0.12 
  6. 7.1.0 
  7. 7.1.1 
  8. 7.1.2 
  9. 7.1.3 
  10. 7.1.4 (current)

This change allows users to test against a broader range of rolldown-vite versions and provides more comprehensive build statistics when using the --stats command.

Fixes #34.

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[Boshen]

@copilot regenerate node override-rolldown.js --stats