fix: use parent directory name for index.ts plugins in deduplication

[ShamanicArts]

Summary

• Fixes plugin deduplication when multiple plugins use index.ts as their filename
• When a plugin file is named index.ts or index.js, the parent directory name is used instead for deduplication

Problem

When configuring multiple local plugins with file:// URLs that use the common index.ts naming convention:

{
  "plugin": [
    "file:///path/to/my-plugin/index.ts",
    "file:///path/to/other-plugin/index.ts"
  ]
}

Both plugins resolve to the name index, causing the deduplication logic to keep only the last one.

Solution

The getPluginName function now checks if the filename is index and uses the parent directory name instead:

• file:///path/to/my-plugin/index.ts → my-plugin
• file:///path/to/other-plugin/index.ts → other-plugin

[github-actions]

Thanks for your contribution!

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2. Add Fixes #<number> or Closes #<number> to this PR description

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found

PR #8758: fix: use full URL for file:// plugin deduplication

• fix: use full URL for file:// plugin deduplication #8758

This PR is related to the same deduplication issue for file:// plugins. While it appears to address the plugin deduplication problem differently (using full URL rather than parent directory name), it's addressing the same core issue of duplicate plugin detection when using local file:// URLs. You may want to check if these approaches should be unified or if PR #8758 is already resolved.

[ShamanicArts]

claude PR before I wanted him too.

tut tut claude