refactor: rename root.zig to detection.zig

src/detection.zig

@@ -0,0 +1,8 @@
+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"),
+};

src/main.zig

@@ -1,5 +1,5 @@
 const std = @import("std");
-const os_module = @import("root.zig").os_module;
+const os_module = @import("detection.zig").os_module;
 
 pub fn main() !void {
     const stdout_file = std.io.getStdOut().writer();