Fix ExcludedFolders configuration not working in directory scanning

[Copilot]

The DocumentOptions.ExcludedFolders configuration was not working properly during repository scanning. Users could configure folder exclusions, but they were completely ignored during the directory scanning process.

Problem

The DocumentsHelper.GetIgnoreFiles() method only included DocumentOptions.ExcludedFiles in the ignore patterns, but never added DocumentOptions.ExcludedFolders. This meant that:

1. Configured folder exclusions like node_modules, build, dist were ignored
2. The ScanDirectory method would still process and include files from supposedly excluded folders
3. When no .gitignore file existed, both ExcludedFiles and ExcludedFolders were completely ignored

Solution

Modified the GetIgnoreFiles() method to always include both DocumentOptions.ExcludedFiles and DocumentOptions.ExcludedFolders in the ignore patterns:

// Before: Only ExcludedFiles were included
ignoreFiles.AddRange(DocumentOptions.ExcludedFiles);

// After: Both ExcludedFiles and ExcludedFolders are included
ignoreFiles.AddRange(DocumentOptions.ExcludedFiles);
ignoreFiles.AddRange(DocumentOptions.ExcludedFolders);

The existing ScanDirectory method already has robust pattern matching logic that supports:

• Exact folder names (node_modules)
• Wildcard patterns (*.tmp)
• Directory-specific patterns (build/)
• Case-insensitive matching

This fix leverages that existing infrastructure without requiring any changes to the directory filtering logic.

Impact

• Backward Compatible: All existing functionality continues to work exactly as before
• Minimal Change: Only 9 insertions, 7 deletions
• Comprehensive: Now supports all the same pattern types for folders as were already supported for files
• Edge Case Fixed: Exclusions now work even when no .gitignore file exists

Example usage that now works properly:

DocumentOptions.ExcludedFolders = new[] { "node_modules", "build", "dist", "*.tmp" };
// Directory scanning will now properly exclude these folders

Fixes #244.

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Pull Request Overview

This PR fixes a configuration bug where the DocumentOptions.ExcludedFolders setting was completely ignored during repository scanning, causing users' folder exclusion configurations to be ineffective.

• Modified GetIgnoreFiles() method to include both excluded files and excluded folders in ignore patterns
• Fixed logic to ensure exclusions work even when no .gitignore file exists
• Leveraged existing pattern matching infrastructure in ScanDirectory method

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