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