all: do not listen on 0.0.0.0 on desktop clients

Since this may create security vulnerabilities such as DNS amplification
or abusing because the listener was exposed to the entire local network.

desktop_darwin.go

@@ -0,0 +1,7 @@
+package ctrld
+
+// IsDesktopPlatform indicates if ctrld is running on a desktop platform,
+// currently defined as macOS or Windows workstation.
+func IsDesktopPlatform() bool {
+	return true
+}