[Bug]: path normalization doesn't handle symlink pointing outside docs correctly w or w/o `mdxRs`

### Version

```sh
System:
    OS: macOS 15.4
    CPU: (10) arm64 Apple M1 Max
    Memory: 3.80 GB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Chrome: 135.0.7049.85
    Safari: 18.4
  npmPackages:
    @rspress/config: workspace:* => 1.0.0
```

### Details

With `mdxRs` enabled

```diff
- "http://localhost:53796/internal/content.html",
+ "http://localhost:53796/content.mdx.html",
```

With `mdxRs` disabled

```diff
- "http://localhost:53330/internal/content.html",
+ "http://localhost:53330/outside/content.html",
```

### Reproduce link

https://github.com/web-infra-dev/rspress/pull/2052

### Reproduce Steps

```sh
pnpm test:e2e symlin
```

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[Bug]: path normalization doesn't handle symlink pointing outside docs correctly w or w/o `mdxRs` #2053

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[Bug]: path normalization doesn't handle symlink pointing outside docs correctly w or w/o mdxRs #2053

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[Bug]: path normalization doesn't handle symlink pointing outside docs correctly w or w/o `mdxRs` #2053