feat: NVIDIA Linux accelerated OSR support

[dsh0416]

Description

Fix Linux Vulkan accelerated OSR on NVIDIA proprietary drivers by addressing the full DMA-BUF import path: CEF Vulkan feature selection, required Vulkan extensions, DRM format modifier handling, memory allocation requirements, and external queue ownership transfer.

This makes the Linux Vulkan DMA-BUF path work more reliably on NVIDIA, while documenting the required nvidia-drm.modeset=1 kernel parameter.

Before this patch, the Linux OSR support has already been working on Intel and AMD GPUs.

Related Issues

Related to #4
Fixes #162

Changes Made

• Enable CEF/ANGLE Vulkan features on Linux when Godot is using the Vulkan backend.
• Request VK_EXT_image_drm_format_modifier and VK_EXT_queue_family_foreign through the Linux Vulkan hook.
• Import DMA-BUF images with DRM modifier metadata, explicit plane layouts, and external image format probing.
• Use per-image memory requirements and compatible FD memory type bits instead of a cached memory type/allocation size.
• Add queue-family acquire/release barriers for externally owned DMA-BUF images.
• Document the NVIDIA DRM modeset requirement.

Testing Performed

• Ran cargo xtask bundle successfully on Linux.
• Verified the NVIDIA DMA-BUF accelerated path with nvidia-drm.modeset=1 enabled.

Checklist

• I tested my changes locally
• I updated docs/tests if needed
• CI passes (or I explained why it does not)

[Copilot]

Pull request overview

This PR improves Linux Vulkan accelerated OSR reliability on NVIDIA proprietary drivers by completing the DMA-BUF import + synchronization path between CEF and Godot, and documenting the required nvidia-drm.modeset=1 configuration.

Changes:

• Inject additional Vulkan device extensions on Linux needed for DRM modifier metadata and external/foreign queue ownership handling.
• Update the Linux Vulkan DMA-BUF importer to include explicit plane layouts, image format probing, per-image memory requirements/type selection, and external ownership acquire/release barriers.
• Enable CEF/ANGLE Vulkan feature selection on Linux when Godot is using Vulkan, and document the NVIDIA DRM modeset requirement.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
README.md	Documents the NVIDIA nvidia-drm.modeset=1 requirement and links to the Vulkan support guide.
docs/api/vulkan-support.md	Adds an NVIDIA driver requirement section with bootloader steps and verification command.
docs/zh_CN/api/vulkan-support.md	Chinese translation of the NVIDIA driver requirement section with the same setup steps.
crates/gdcef/src/vulkan_hook/linux.rs	Extends Linux Vulkan hook to request DRM modifier + queue family foreign extensions when supported.
crates/gdcef/src/accelerated_osr/windows/vulkan.rs	Plumbs shared copy-context changes (memory requirements function pointer + external queue family field default).
crates/gdcef/src/accelerated_osr/vulkan_common.rs	Adds external-queue acquire/release barriers for DMA-BUF-backed source images during copy submission.
crates/gdcef/src/accelerated_osr/linux/vulkan.rs	Implements NVIDIA-focused DMA-BUF import robustness: modifier plane layouts, format probing, per-image memory requirements, and queue-submit locking.
crates/cef_app/src/lib.rs	Enables Vulkan-related Chromium/ANGLE feature flags for Linux when the Godot backend is Vulkan.

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