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/vk/mod.rs

@@ -47,7 +47,7 @@ pub enum FrameInput<'a> {
     D3d11(pf_client_core::video::D3d11Frame),
     /// PyroWave planar output — three R8 plane views already on THIS device, decode
     /// fence-complete, GENERAL layout (`pf_client_core::video_pyrowave`).
-    #[cfg(all(target_os = "linux", feature = "pyrowave"))]
+    #[cfg(all(any(target_os = "linux", windows), feature = "pyrowave"))]
     PyroWave(pf_client_core::video_pyrowave::PyroWavePlanarFrame),
 }
 
@@ -136,7 +136,7 @@ pub struct Presenter {
     csc: CscPass,
     /// The planar (3-plane) CSC variant for PyroWave frames; built only when the device
     /// passed the pyrowave probe.
-    #[cfg(all(target_os = "linux", feature = "pyrowave"))]
+    #[cfg(all(any(target_os = "linux", windows), feature = "pyrowave"))]
     csc_planar: Option<CscPass>,
     /// FFmpeg Vulkan Video decode handles — `None` when the stack can't do it.
     video_export: Option<pf_client_core::video::VulkanDecodeDevice>,
@@ -304,7 +304,7 @@ impl Drop for Presenter {
             #[cfg(target_os = "linux")]
             self.hw.take();
             self.csc.destroy(&self.device);
-            #[cfg(all(target_os = "linux", feature = "pyrowave"))]
+            #[cfg(all(any(target_os = "linux", windows), feature = "pyrowave"))]
             if let Some(p) = &self.csc_planar {
                 p.destroy(&self.device);
             }