ignores nextjs route groups

### Description

example:
`"include": ["src/app/(site)/(etc)/upgrade"],`

output:

```
📊 Pack Summary:
────────────────
  Total Files: 0 files
 Total Tokens: 25 tokens
  Total Chars: 127 chars
```

upgrade file exists

### Usage Context

Repomix CLI

### Repomix Version

1.8.0

### Node.js Version

_No response_