feat(video): Vulkan Video decode on the presenter's device (NVIDIA hw decode)

FFmpeg's Vulkan Video decoder now runs on the PRESENTER's own VkDevice —
the decoded VkImage feeds the existing CICP CSC pass directly: zero
copy, no interop, and NVIDIA gets hardware decode for the first time
(its VAAPI is unusable by design). One decode architecture for every
vendor going forward; VAAPI-dmabuf and software remain the fallbacks
(auto: vulkan → vaapi → software; PUNKTFUNK_DECODER=vulkan pins it).

Presenter: instance 1.3; probes VK_KHR_video_queue/decode_queue + codec
extensions, a VIDEO_DECODE queue family (+ its codec caps via
QueueFamilyVideoPropertiesKHR), and the samplerYcbcrConversion/
timelineSemaphore/synchronization2 features — all enabled at device
creation when present, exported as a VulkanDecodeDevice handle bundle.

Decoder: AVVulkanDeviceContext built over those handles via pf-ffvk
(features chain, extension lists, deprecated queue indices + the qf[]
map); get_format supplies OUR frames context with MUTABLE_FORMAT so the
presenter's per-plane views are legal; output is DecodedImage::VkFrame
carrying AVVkFrame/frames-ctx pointers plus the lock fns.

Present: R8+R8G8 plane views over the multiplanar image, the live sync
state read under the AVVulkanFramesContext lock, a timeline-semaphore
wait(sem_value)/signal(sem_value+1) folded into the submit, layout/
queue-family/sem_value written back per FFmpeg's contract, and the frame
guard parked in the retire queue until the fence. CSC pass + video
framebuffer are now unconditional (NVIDIA has no dmabuf-import path).

Verified on the RTX 5070 Ti: device creates with decode_qf=3,
caps=DECODE_H264|H265|AV1|VP9; swapchain unaffected. Live stream
validation next.

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

clients/linux-session/src/main.rs

@@ -89,6 +89,7 @@ mod session_main {
         gamepad: &GamepadService,
         native: Mode,
         force_software: Arc<AtomicBool>,
+        vulkan: Option<pf_client_core::video::VulkanDecodeDevice>,
     ) -> SessionParams {
         let mode = Mode {
             width: if settings.width == 0 {
@@ -126,6 +127,7 @@ mod session_main {
             // PUNKTFUNK_DECODER still overrides inside the decoder for bisects.
             decoder: settings.decoder.clone(),
             launch,
+            vulkan,
             pin: Some(pin),
             identity,
             connect_timeout: connect_timeout(),
@@ -259,19 +261,21 @@ mod session_main {
             overlay: None,
         };
 
-        let outcome = pf_presenter::run_session(opts, move |gamepad, native, force_software| {
-            session_params(
-                &settings,
-                addr,
-                port,
-                pin,
-                identity,
-                launch,
-                gamepad,
-                native,
-                force_software,
-            )
-        });
+        let outcome =
+            pf_presenter::run_session(opts, move |gamepad, native, force_software, vulkan| {
+                session_params(
+                    &settings,
+                    addr,
+                    port,
+                    pin,
+                    identity,
+                    launch,
+                    gamepad,
+                    native,
+                    force_software,
+                    vulkan,
+                )
+            });
 
         match outcome {
             Ok(pf_presenter::Outcome::Ended(None)) => 0,