[tools] MSVC environment loader, POSIX vulkan/MSVC install scripts (#2993)

* also move install-vulkan-sdk.ps1 to tools

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2993
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Co-committed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>

tools/windows/install-vulkan-sdk.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/sh
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+: "${VULKAN_SDK_VER:=1.4.328.1}"
+: "${VULKAN_ROOT:=C:/VulkanSDK/$VULKAN_SDK_VER}"
+EXE_FILE="vulkansdk-windows-X64-$VULKAN_SDK_VER.exe"
+URI="https://sdk.lunarg.com/sdk/download/$VULKAN_SDK_VER/windows/$EXE_FILE"
+VULKAN_ROOT_UNIX=$(cygpath -u "$VULKAN_ROOT")
+
+# Check if Vulkan SDK is already installed
+if [ -d "$VULKAN_ROOT_UNIX" ]; then
+    echo "-- Vulkan SDK already installed at $VULKAN_ROOT_UNIX"
+    exit 0
+fi
+
+echo "Downloading Vulkan SDK $VULKAN_SDK_VER from $URI"
+[ ! -f "./$EXE_FILE" ] && curl -L -o "./$EXE_FILE" "$URI"
+chmod +x "./$EXE_FILE"
+echo "Finished downloading $EXE_FILE"
+
+echo "Installing Vulkan SDK $VULKAN_SDK_VER..."
+if net session > /dev/null 2>&1; then
+    ./$EXE_FILE --root "$VULKAN_ROOT" --accept-licenses --default-answer --confirm-command install
+else
+    echo "This script must be run with administrator privileges!"
+    exit 1
+fi
+
+echo "Finished installing Vulkan SDK $VULKAN_SDK_VER"
+
+# GitHub Actions integration
+if [ \"${GITHUB_ACTIONS:-false}\" = \"true\" ]; then
+    echo \"VULKAN_SDK=$VULKAN_ROOT\" >> \"$GITHUB_ENV\"
+    echo \"$VULKAN_ROOT/bin\" >> \"$GITHUB_PATH\"
+fi