Add Makefile for build automation

Makefile

@@ -0,0 +1,80 @@
+# WireGuard Admin TUI
+.PHONY: help build clean install test fmt lint run deps
+
+# Binary name
+BINARY=wg-tui
+CMD_PATH=./cmd/$(BINARY)
+
+# Build directory
+BUILD_DIR=build
+
+# Go parameters
+GOCMD=go
+GOBUILD=$(GOCMD) build
+GOCLEAN=$(GOCMD) clean
+GOTEST=$(GOCMD) test
+GOGET=$(GOCMD) get
+GOMOD=$(GOCMD) mod
+
+help: ## Show this help message
+	@echo 'Usage: make [target]'
+	@echo ''
+	@echo 'Available targets:'
+	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "  %-15s %s\n", $$1, $$2}' $(MAKEFILE_LIST)
+
+build: ## Build the binary
+	@echo "Building $(BINARY)..."
+	@$(GOBUILD) -o $(BINARY) $(CMD_PATH)/main.go
+	@echo "Build complete: $(BINARY)"
+
+build-all: ## Build all binaries
+	@echo "Building all binaries..."
+	@$(GOBUILD) -o $(BINARY) ./...
+
+clean: ## Clean build artifacts
+	@echo "Cleaning..."
+	@$(GOCLEAN)
+	@rm -f $(BINARY)
+	@echo "Clean complete"
+
+install: ## Install the binary to $GOPATH/bin
+	@echo "Installing $(BINARY)..."
+	@$(GOBUILD) -o $$($(GOCMD) env GOPATH)/bin/$(BINARY) $(CMD_PATH)/main.go
+	@echo "Install complete"
+
+test: ## Run tests
+	@echo "Running tests..."
+	@$(GOTEST) -v ./...
+
+test-coverage: ## Run tests with coverage
+	@echo "Running tests with coverage..."
+	@$(GOTEST) -v -coverprofile=coverage.out ./...
+	@$(GOCMD) tool cover -html=coverage.out -o coverage.html
+
+fmt: ## Format Go code
+	@echo "Formatting code..."
+	@$(GOCMD) fmt ./...
+
+lint: ## Run golangci-lint (if installed)
+	@echo "Running linter..."
+	@if command -v golangci-lint > /dev/null; then \
+		golangci-lint run; \
+	else \
+		echo "golangci-lint not found. Install from https://golangci-lint.run/usage/install/"; \
+	fi
+
+deps: ## Download dependencies
+	@echo "Downloading dependencies..."
+	@$(GOMOD) download
+	@$(GOMOD) tidy
+
+run: build ## Build and run the binary
+	@echo "Running $(BINARY)..."
+	@./$(BINARY)
+
+dev: ## Run in development mode with hot reload (requires air)
+	@if command -v air > /dev/null; then \
+		air; \
+	else \
+		echo "air not found. Install with: go install github.com/cosmtrek/air@latest"; \
+	fi