chore(v2): vendor dependencies for offline/China builds

go mod vendor pins onnxruntime_go v1.12.1, Gio and the rest into v2/vendor
so go run/build work without hitting proxy.golang.org (blocked/slow in
China). Verified: CGO_ENABLED=1 go build -mod=vendor ./internal/spike and
GOOS=windows go build -mod=vendor ./internal/ui both pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

v2/vendor/gioui.org/internal/vk/vulkan_android.go

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+//go:build !nowayland
+// +build !nowayland
+
+package vk
+
+/*
+#define VK_USE_PLATFORM_ANDROID_KHR
+#define VK_NO_PROTOTYPES 1
+#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) typedef uint64_t object;
+#include <android/native_window.h>
+#include <vulkan/vulkan.h>
+
+static VkResult vkCreateAndroidSurfaceKHR(PFN_vkCreateAndroidSurfaceKHR f, VkInstance instance, const VkAndroidSurfaceCreateInfoKHR *pCreateInfo, const VkAllocationCallbacks *pAllocator, VkSurfaceKHR *pSurface) {
+	return f(instance, pCreateInfo, pAllocator, pSurface);
+}
+*/
+import "C"
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+var wlFuncs struct {
+	vkCreateAndroidSurfaceKHR C.PFN_vkCreateAndroidSurfaceKHR
+}
+
+func init() {
+	loadFuncs = append(loadFuncs, func(dlopen func(name string) *[0]byte) {
+		wlFuncs.vkCreateAndroidSurfaceKHR = dlopen("vkCreateAndroidSurfaceKHR")
+	})
+}
+
+func CreateAndroidSurface(inst Instance, window unsafe.Pointer) (Surface, error) {
+	inf := C.VkAndroidSurfaceCreateInfoKHR{
+		sType:  C.VK_STRUCTURE_TYPE_ANDROID_SURFACE_CREATE_INFO_KHR,
+		window: (*C.ANativeWindow)(window),
+	}
+	var surf Surface
+	if err := vkErr(C.vkCreateAndroidSurfaceKHR(wlFuncs.vkCreateAndroidSurfaceKHR, inst, &inf, nil, &surf)); err != nil {
+		return 0, fmt.Errorf("vulkan: vkCreateAndroidSurfaceKHR: %w", err)
+	}
+	return surf, nil
+}

v2/vendor/gioui.org/internal/vk/vulkan_wayland.go

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+//go:build ((linux && !android) || freebsd) && !nowayland
+// +build linux,!android freebsd
+// +build !nowayland
+
+package vk
+
+/*
+#cgo linux pkg-config: wayland-client
+
+#define VK_USE_PLATFORM_WAYLAND_KHR
+#define VK_NO_PROTOTYPES 1
+#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) typedef uint64_t object;
+#include <vulkan/vulkan.h>
+
+static VkResult vkCreateWaylandSurfaceKHR(PFN_vkCreateWaylandSurfaceKHR f, VkInstance instance, const VkWaylandSurfaceCreateInfoKHR *pCreateInfo, const VkAllocationCallbacks *pAllocator, VkSurfaceKHR *pSurface) {
+	return f(instance, pCreateInfo, pAllocator, pSurface);
+}
+*/
+import "C"
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+var wlFuncs struct {
+	vkCreateWaylandSurfaceKHR C.PFN_vkCreateWaylandSurfaceKHR
+}
+
+func init() {
+	loadFuncs = append(loadFuncs, func(dlopen func(name string) *[0]byte) {
+		wlFuncs.vkCreateWaylandSurfaceKHR = dlopen("vkCreateWaylandSurfaceKHR")
+	})
+}
+
+func CreateWaylandSurface(inst Instance, disp unsafe.Pointer, wlSurf unsafe.Pointer) (Surface, error) {
+	inf := C.VkWaylandSurfaceCreateInfoKHR{
+		sType:   C.VK_STRUCTURE_TYPE_WAYLAND_SURFACE_CREATE_INFO_KHR,
+		display: (*C.struct_wl_display)(disp),
+		surface: (*C.struct_wl_surface)(wlSurf),
+	}
+	var surf Surface
+	if err := vkErr(C.vkCreateWaylandSurfaceKHR(wlFuncs.vkCreateWaylandSurfaceKHR, inst, &inf, nil, &surf)); err != nil {
+		return 0, fmt.Errorf("vulkan: vkCreateWaylandSurfaceKHR: %w", err)
+	}
+	return surf, nil
+}

v2/vendor/gioui.org/internal/vk/vulkan_x11.go

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+//go:build ((linux && !android) || freebsd) && !nox11
+// +build linux,!android freebsd
+// +build !nox11
+
+package vk
+
+/*
+#define VK_USE_PLATFORM_XLIB_KHR
+#define VK_NO_PROTOTYPES 1
+#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) typedef uint64_t object;
+#include <vulkan/vulkan.h>
+
+static VkResult vkCreateXlibSurfaceKHR(PFN_vkCreateXlibSurfaceKHR f, VkInstance instance, const VkXlibSurfaceCreateInfoKHR *pCreateInfo, const VkAllocationCallbacks *pAllocator, VkSurfaceKHR *pSurface) {
+	return f(instance, pCreateInfo, pAllocator, pSurface);
+}
+*/
+import "C"
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+var x11Funcs struct {
+	vkCreateXlibSurfaceKHR C.PFN_vkCreateXlibSurfaceKHR
+}
+
+func init() {
+	loadFuncs = append(loadFuncs, func(dlopen func(name string) *[0]byte) {
+		x11Funcs.vkCreateXlibSurfaceKHR = dlopen("vkCreateXlibSurfaceKHR")
+	})
+}
+
+func CreateXlibSurface(inst Instance, dpy unsafe.Pointer, window uintptr) (Surface, error) {
+	inf := C.VkXlibSurfaceCreateInfoKHR{
+		sType:  C.VK_STRUCTURE_TYPE_XLIB_SURFACE_CREATE_INFO_KHR,
+		dpy:    (*C.Display)(dpy),
+		window: (C.Window)(window),
+	}
+	var surf Surface
+	if err := vkErr(C.vkCreateXlibSurfaceKHR(x11Funcs.vkCreateXlibSurfaceKHR, inst, &inf, nil, &surf)); err != nil {
+		return 0, fmt.Errorf("vulkan: vkCreateXlibSurfaceKHR: %w", err)
+	}
+	return surf, nil
+}