fix(install): remove premature pkg-config check (#228)

pkg-config is included in the package list to install, so the script
should not exit with an error if it's not already installed. The check
was preventing installation on fresh systems like WSL Ubuntu 24.04.

The script already has proper fallbacks for when pkg-config is not
available (detect_vulkan and detect_typelib_path both check before
calling pkg-config).

install.sh

@@ -843,21 +843,6 @@ pacman_package_installed() {
 install_system_dependencies() {
     print_info "Installing system dependencies..."
 
-    # Check for pkg-config first (required for library detection)
-    if ! command_exists pkg-config; then
-        print_error "pkg-config is not installed but is required for library detection"
-        print_info "Please install pkg-config using your package manager:"
-        print_info "  Ubuntu/Debian: sudo apt install pkg-config"
-        print_info "  Fedora/RHEL: sudo dnf install pkg-config"
-        print_info "  Arch: sudo pacman -S pkgconf"
-        print_info "  openSUSE: sudo zypper install pkg-config"
-        print_info "  Gentoo: sudo emerge pkgconf"
-        print_info "  Alpine: sudo apk add pkgconf"
-        print_info "  Void: sudo xbps-install -Sy pkg-config"
-        print_info "  Solus: sudo eopkg install pkg-config"
-        exit 1
-    fi
-
     # Determine which Vulkan shader package is available (glslc for Ubuntu 24.04+, glslang-tools for 22.04)
     local VULKAN_SHADER_PKG="glslang-tools"  # Default fallback
     if apt-cache show glslc &>/dev/null 2>&1; then