feat(client/windows): PyroWave decode + surface it in the GUI codec picker

The decoder was gated to Linux because, when it landed, the Windows client
still had its own in-process WinUI/D3D11 presenter and the PyroWave present
path there was an open question. That client has since been retired: Windows
now spawns the SAME Vulkan session presenter as Linux, and the decoder is
plain Vulkan compute on the presenter's device (no fds, no dmabuf, no D3D11
interop), so the question that gated it answered itself. pyrowave-sys already
builds on Windows too -- the Windows HOST encoder ships on it.

So this is a port by un-gating: every cfg(all(target_os = "linux", feature =
"pyrowave")) becomes any(linux, windows) -- decoder module, backend variant,
Decoder::new_pyrowave, the CODEC_PYROWAVE advertisement, the session pump's
opt-in/build/label arms, and the presenter's planar CSC pass. No new code.

Then offer it in the Windows GUI, which is what prompted this. It stays
preference-only (resolve_codec never auto-picks it) and a host or device that
can't do PyroWave just falls back down the ladder to HEVC.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/pf-presenter/src/run.rs

@@ -194,7 +194,7 @@ struct StreamState {
     /// PyroWave present has no demote rung (nothing else decodes the codec), so a
     /// persistent non-device-lost present failure would warn on every frame. Latch it:
     /// warn on the first failure of a streak, then stay quiet until a present succeeds.
-    #[cfg(all(target_os = "linux", feature = "pyrowave"))]
+    #[cfg(all(any(target_os = "linux", windows), feature = "pyrowave"))]
     pyro_present_warned: bool,
     hw_fails: u32,
     /// The OSD's text (multi-line; rebuilt each Stats window and on a live tier cycle).
@@ -267,7 +267,7 @@ impl StreamState {
             win_start: Instant::now(),
             presented: PresentedWindow::default(),
             dmabuf_demoted: false,
-            #[cfg(all(target_os = "linux", feature = "pyrowave"))]
+            #[cfg(all(any(target_os = "linux", windows), feature = "pyrowave"))]
             pyro_present_warned: false,
             hw_fails: 0,
             osd_text: String::new(),
@@ -1007,7 +1007,7 @@ fn run_inner(mut opts: SessionOpts, mut mode: ModeCtl) -> Result<Option<Outcome>
                     // PyroWave planar frames: already on the presenter's device and
                     // fence-complete — a present failure has no demote rung (nothing
                     // else decodes the codec); only device loss ends the session.
-                    #[cfg(all(target_os = "linux", feature = "pyrowave"))]
+                    #[cfg(all(any(target_os = "linux", windows), feature = "pyrowave"))]
                     DecodedImage::PyroWave(f) => {
                         // The wavelet stream carries the negotiated ColorInfo (no VUI): an
                         // HDR (PQ) pyrowave session presents through the HDR10 path exactly