Add Windows SPTI backend, CI check, platform support complete

- scsi/windows.rs: SCSI_PASS_THROUGH_DIRECT via DeviceIoControl
- Device path normalization (D:, \\.\CdRom0, \\.\D:)
- Windows drive discovery (CdRom0-15 + drive letters)
- CI: cargo check on windows-latest
- Platform table: Linux + macOS + Windows all supported

.github/workflows/ci.yml

@@ -19,3 +19,10 @@ jobs:
       - uses: actions/checkout@v5
       - uses: dtolnay/rust-toolchain@stable
       - run: cargo check
+
+  check-windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo check