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/app/egl_wayland.go

@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+//go:build ((linux && !android) || freebsd) && !nowayland && !noopengl
+// +build linux,!android freebsd
+// +build !nowayland
+// +build !noopengl
+
+package app
+
+import (
+	"errors"
+	"unsafe"
+
+	"gioui.org/internal/egl"
+)
+
+/*
+#cgo linux pkg-config: egl wayland-egl
+#cgo freebsd openbsd LDFLAGS: -lwayland-egl
+#cgo CFLAGS: -DEGL_NO_X11
+
+#include <EGL/egl.h>
+#include <wayland-client.h>
+#include <wayland-egl.h>
+*/
+import "C"
+
+type wlContext struct {
+	win *window
+	*egl.Context
+	eglWin *C.struct_wl_egl_window
+}
+
+func init() {
+	newWaylandEGLContext = func(w *window) (context, error) {
+		disp := egl.NativeDisplayType(unsafe.Pointer(w.display()))
+		ctx, err := egl.NewContext(disp)
+		if err != nil {
+			return nil, err
+		}
+
+		surf, width, height := w.surface()
+		if surf == nil {
+			return nil, errors.New("wayland: no surface")
+		}
+		eglWin := C.wl_egl_window_create(surf, C.int(width), C.int(height))
+		if eglWin == nil {
+			return nil, errors.New("wayland: wl_egl_window_create failed")
+		}
+		eglSurf := egl.NativeWindowType(uintptr(unsafe.Pointer(eglWin)))
+		if err := ctx.CreateSurface(eglSurf); err != nil {
+			return nil, err
+		}
+		// We're in charge of the frame callbacks, don't let eglSwapBuffers
+		// wait for callbacks that may never arrive.
+		ctx.EnableVSync(false)
+
+		return &wlContext{Context: ctx, win: w, eglWin: eglWin}, nil
+	}
+}
+
+func (c *wlContext) Release() {
+	if c.Context != nil {
+		c.Context.Release()
+		c.Context = nil
+	}
+	if c.eglWin != nil {
+		C.wl_egl_window_destroy(c.eglWin)
+		c.eglWin = nil
+	}
+}
+
+func (c *wlContext) Refresh() error {
+	surf, width, height := c.win.surface()
+	if surf == nil {
+		return errors.New("wayland: no surface")
+	}
+	C.wl_egl_window_resize(c.eglWin, C.int(width), C.int(height), 0, 0)
+	return nil
+}
+
+func (c *wlContext) Lock() error {
+	return c.Context.MakeCurrent()
+}
+
+func (c *wlContext) Unlock() {
+	c.Context.ReleaseCurrent()
+}