refactor: rename root.zig to detection.zig

src/root.zig

@@ -1,8 +0,0 @@
-const std = @import("std");
-
-pub const os_module = switch (@import("builtin").os.tag) {
-    .linux => @import("linux/linux.zig"),
-    .macos => @import("macos/macos.zig"),
-    .windows => @import("windows/windows.zig"),
-    else => @compileError("Unsupported operating system"),
-};