Change sample server host from 0.0.0.0 to 127.0.0.1

Don't bind the sample server to `0.0.0.0` by default as that exposes the server to anyone else on the local network.

If anyone were to use these samples as staring points to build larger services, those servers would thus expose developers to attack immediately upon launch.

I'd prefer if we avoided that 😆

Author: JLLeitschuh

samples/kotlin-mcp-server/src/commonMain/kotlin/server.kt

@@ -101,7 +101,7 @@ suspend fun runSseMcpServerWithPlainConfiguration(port: Int) {
 
     val server = configureServer()
 
-    embeddedServer(CIO, host = "0.0.0.0", port = port) {
+    embeddedServer(CIO, host = "127.0.0.1", port = port) {
         install(SSE)
         routing {
             sse("/sse") {
@@ -145,7 +145,7 @@ suspend fun runSseMcpServerUsingKtorPlugin(port: Int) {
     println("Starting sse server on port $port")
     println("Use inspector to connect to the http://localhost:$port/sse")
 
-    embeddedServer(CIO, host = "0.0.0.0", port = port) {
+    embeddedServer(CIO, host = "127.0.0.1", port = port) {
         mcp {
             return@mcp configureServer()
         }