Add Windows UEFI boot structure validation

[ashishsinghbora]

Problem Statement

A USB can contain the correct files but still fail to boot.

Checking only file extraction is therefore not enough.

Proposed Solution / Enhancement

Add validation for the important Windows boot structure, including:

• EFI boot files
• bootmgr
• BCD
• Required boot directories
• Expected boot file relationships

FlashCore should report an error when required boot structures are missing or invalid.

Architectural Layer Impacted

Windows UEFI Layer / FAT32 / Verification

Alternatives Considered

Checking only whether files exist does not prove that the resulting media has a valid Windows boot structure.