Add Windows ISO and WIM/SWM integration tests

[ashishsinghbora]

Problem Statement

Windows installation media can contain large files that cannot always fit directly into a FAT32 filesystem.

FlashCore must reliably handle this situation.

Proposed Solution / Enhancement

Create test fixtures covering:

• Windows ISO with normal files
• ISO containing install.wim
• ISO containing install.esd
• WIM smaller than the FAT32 file-size limit
• WIM larger than the FAT32 file-size limit
• WIM requiring multiple SWM files

Verify that:

• Files are extracted correctly.
• WIM splitting produces the expected files.
• The generated files are complete.
• The original image can be reconstructed correctly where applicable.

Architectural Layer Impacted

Windows Image Pipeline / FAT32 / ISO9660

Alternatives Considered

Testing WIM splitting only with one sample image may miss boundary conditions.