Refactor: drive discovery into platform files, no inline cfg

- drive/unix.rs: find_drives() + resolve_device() for Linux/macOS
- drive/windows.rs: find_drives() + resolve_device() + normalize_path() for Windows
- drive/mod.rs: clean delegation, no cfg branches
- scsi/windows.rs: SPTI transport only, no drive discovery

src/scsi/windows.rs

@@ -194,84 +194,3 @@ impl ScsiTransport for SptiTransport {
     }
 }
 
-// ── Device path helpers ────────────────────────────────────────────────────
-
-/// Normalize a device path to Windows \\.\X: format.
-///
-/// Accepts: "D:", "D:\\", "\\.\D:", "\\.\CdRom0"
-pub(crate) fn normalize_device_path(path: &str) -> String {
-    // Already in \\.\X format
-    if path.starts_with("\\\\.\\") {
-        return path.to_string();
-    }
-
-    // Single drive letter: "D:" or "D:\"
-    let trimmed = path.trim_end_matches('\\');
-    if trimmed.len() == 2 && trimmed.as_bytes()[1] == b':' {
-        return format!("\\\\.\\{}", trimmed);
-    }
-
-    // CdRomN format
-    if path.to_lowercase().starts_with("cdrom") {
-        return format!("\\\\.\\{}", path);
-    }
-
-    // Fallback: wrap in \\.\
-    format!("\\\\.\\{}", path)
-}
-
-/// Find all optical drives on Windows.
-/// Scans drive letters A-Z and CdRom0-15.
-pub fn find_drives() -> Vec<(String, crate::identity::DriveId)> {
-    let mut drives = Vec::new();
-
-    // Try CdRom0..CdRom15
-    for i in 0..16 {
-        let path = format!("\\\\.\\CdRom{}", i);
-        if let Ok(mut transport) = SptiTransport::open(Path::new(&path)) {
-            if let Ok(id) = crate::identity::DriveId::from_drive(&mut transport) {
-                if !id.raw_inquiry.is_empty() && (id.raw_inquiry[0] & 0x1F) == 0x05 {
-                    drives.push((path, id));
-                }
-            }
-        }
-    }
-
-    // Also try drive letters if CdRom didn't find anything
-    if drives.is_empty() {
-        for letter in b'D'..=b'Z' {
-            let path = format!("{}:", letter as char);
-            if let Ok(mut transport) = SptiTransport::open(Path::new(&path)) {
-                if let Ok(id) = crate::identity::DriveId::from_drive(&mut transport) {
-                    if !id.raw_inquiry.is_empty() && (id.raw_inquiry[0] & 0x1F) == 0x05 {
-                        drives.push((path, id));
-                    }
-                }
-            }
-        }
-    }
-
-    drives
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn normalize_drive_letter() {
-        assert_eq!(normalize_device_path("D:"), "\\\\.\\D:");
-        assert_eq!(normalize_device_path("E:\\"), "\\\\.\\E:");
-    }
-
-    #[test]
-    fn normalize_already_prefixed() {
-        assert_eq!(normalize_device_path("\\\\.\\D:"), "\\\\.\\D:");
-        assert_eq!(normalize_device_path("\\\\.\\CdRom0"), "\\\\.\\CdRom0");
-    }
-
-    #[test]
-    fn normalize_cdrom() {
-        assert_eq!(normalize_device_path("CdRom0"), "\\\\.\\CdRom0");
-    }
-}