fix: useful Docker bind address output in serve

When binding to 0.0.0.0 (--host 0.0.0.0), print "localhost" and
"<host-ip>" URLs instead of the raw 0.0.0.0 address. Also handles
nil TCPAddr.IP to avoid the ":::" garbled display in Docker.

Makefile

@@ -45,10 +45,6 @@ electron-build-linux: build akaiutil
 
 # ─── Server / remote ───────────────────────────────────────
 
-install: build
-	scp $(BIN) $(REMOTE):/tmp/$(BIN) && \
-	ssh $(REMOTE) "sudo mv /tmp/$(BIN) /DATA/Downloads/akai/$(BIN) && sudo chmod +x /DATA/Downloads/akai/$(BIN)"
-
 clean:
 	rm -f $(BIN)
 	rm -rf $(ELECTRON_DIR)/dist
@@ -57,4 +53,4 @@ clean:
 
 .PHONY: build akaiutil all docker docker-run docker-up docker-down serve \
         electron-deps electron-dev electron-build electron-build-mac electron-build-linux \
-        install clean
+        clean

serve.go

@@ -65,12 +65,22 @@ func cmdServe(args []string) {
 	}
 
 	realPort := listener.Addr().(*net.TCPAddr).Port
-	realHost := listener.Addr().(*net.TCPAddr).IP.String()
+	realHost := "0.0.0.0"
+	if ip := listener.Addr().(*net.TCPAddr).IP; ip != nil {
+		realHost = ip.String()
+	}
 
 	fmt.Printf("\n  AKAI Utils Server\n")
 	fmt.Printf("  =================\n\n")
+	if realHost == "0.0.0.0" || realHost == "::" || realHost == "" || realHost == "<nil>" {
+		fmt.Printf("  Local:   http://localhost:%d\n", realPort)
+		if realHost == "0.0.0.0" {
+			fmt.Printf("  Network: http://<host-ip>:%d\n", realPort)
+		}
+	} else {
 		fmt.Printf("  Local:   http://%s:%d\n", realHost, realPort)
-	fmt.Printf("  API:     http://%s:%d/api/\n", realHost, realPort)
+	}
+	fmt.Printf("  API:     http://localhost:%d/api/\n", realPort)
 	fmt.Printf("  Quit:    Ctrl+C\n\n")
 
 	if openBrowser {