chore(makefile): add platform-aware build, cross-compilation, and uti…

Makefile

@@ -1,8 +1,37 @@
-.PHONEY: build
+.PHONY: help build build-all clean
+
+## Show help info
+help:
+	@echo "Usage: make <target>"
+	@echo ""
+	@echo "Targets:"
+	@echo "  build        Build CLI for current OS/Arch"
+	@echo "  build-all    Cross-compile CLI for all major platforms"
+	@echo "  clean        Remove all compiled binaries from ./bin"
+	@echo "  help         Show this help message"
+
+## Build CLI for current OS/Arch
 build:
+	@mkdir -p bin
+	@goos=$$(go env GOOS); \
+	goarch=$$(go env GOARCH); \
+	ext=""; \
+	if [ "$$goos" = "windows" ]; then ext=".exe"; fi; \
+	out="bin/kubeslice-cli-$$goos-$$goarch$$ext"; \
+	echo "Building for $$goos/$$goarch -> $$out"; \
+	go build -o $$out main.go
+
+## Build CLI for all target platforms
+build-all:
+	@mkdir -p bin
 	GOOS=windows GOARCH=amd64 go build -o bin/kubeslice-cli-windows-amd64.exe main.go
 	GOOS=linux GOARCH=amd64 go build -o bin/kubeslice-cli-linux-amd64 main.go
 	GOOS=linux GOARCH=arm go build -o bin/kubeslice-cli-linux-arm main.go
 	GOOS=linux GOARCH=arm64 go build -o bin/kubeslice-cli-linux-arm64 main.go
 	GOOS=darwin GOARCH=amd64 go build -o bin/kubeslice-cli-darwin-amd64 main.go
-	GOOS=darwin GOARCH=arm64 go build -o bin/kubeslice-cli-darwin-arm64 main.go
+	GOOS=darwin GOARCH=arm64 go build -o bin/kubeslice-cli-darwin-arm64 main.go
+
+## Clean up build artifacts
+clean:
+	@echo "Removing bin directory and compiled binaries..."
+	@rm -rf bin