This commit renames QEFIPartitionInfo to QEFIPartitionScanInfo to avoid
naming conflicts with PR #45's QEFIPartitionInfo struct, which serves
a different purpose (high-level partition management vs. low-level
scanning with byte offsets).

Changes:
- Rename QEFIPartitionInfo → QEFIPartitionScanInfo in:
  * qefipartitionscanner.h/cpp
  * qefifileselectiondialog.h/cpp
  * qefiloadoptioneditorview.cpp

- Add documentation explaining the difference:
  * QEFIPartitionScanInfo (ours): Low-level partition scan data with
    byte offsets for direct filesystem access
  * QEFIPartitionInfo (PR #45): High-level partition metadata for
    mounting/unmounting through OS

- Add INTEGRATION_WITH_PR45.md documenting:
  * How the two features complement each other
  * Different approaches (mounting vs. direct access)
  * Benefits of each approach
  * Future integration opportunities

The two features work independently but complement each other:
- PR #45: General EFI partition management (mount/unmount, view properties)
- Our implementation: Boot entry creation workflow (browse & select EFI files)

No conflicts exist as they use different source files and struct names.
Both require admin/root privileges and work cross-platform.