Add WireGuard TUI implementation

- Add Go TUI with bubbletea for WireGuard management
- Implement client CRUD operations with QR code generation
- Add configuration and validation modules
- Install/update scripts for client setup
- Update Makefile to build binaries to bin/ directory
- Add .gitignore for Go projects

Makefile

@@ -9,7 +9,8 @@ BINARY=wg-tui
 CMD_PATH=$(ROOTDIR)/cmd/$(BINARY)
 
 # Build directory
-BUILD_DIR=build
+BUILD_DIR=bin
+BINARY_PATH=$(BUILD_DIR)/$(BINARY)
 
 # Go parameters
 GOCMD=go
@@ -27,23 +28,25 @@ help: ## Show this help message
 
 build: ## Build the binary
 	@echo "Building $(BINARY)..."
-	@$(GOBUILD) -C $(ROOTDIR) -o $(BINARY) cmd/$(BINARY)/main.go
-	@echo "Build complete: $(BINARY)"
+	@mkdir -p $(BUILD_DIR)
+	@$(GOBUILD) -C $(ROOTDIR) -o $(BINARY_PATH) cmd/$(BINARY)/main.go
+	@echo "Build complete: $(BINARY_PATH)"
 
 build-all: ## Build all binaries
 	@echo "Building all binaries..."
-	@$(GOBUILD) -C $(ROOTDIR) -o $(BINARY) ./...
+	@mkdir -p $(BUILD_DIR)
+	@$(GOBUILD) -C $(ROOTDIR) -o $(BINARY_PATH) ./...
 
 clean: ## Clean build artifacts
 	@echo "Cleaning..."
 	@$(GOCLEAN)
-	@rm -f $(BINARY)
+	@rm -rf $(BUILD_DIR)
 	@echo "Clean complete"
 
 install: ## Install the binary to $GOPATH/bin
 	@echo "Installing $(BINARY)..."
 	@$(GOBUILD) -C $(ROOTDIR) -o $$($(GOCMD) env GOPATH)/bin/$(BINARY) cmd/$(BINARY)/main.go
-	@echo "Install complete"
+	@echo "Install complete: $$($(GOCMD) env GOPATH)/bin/$(BINARY)"
 
 test: ## Run tests
 	@echo "Running tests..."
@@ -73,7 +76,7 @@ deps: ## Download dependencies
 
 run: build ## Build and run the binary
 	@echo "Running $(BINARY)..."
-	@./$(BINARY)
+	@./$(BINARY_PATH)
 
 dev: ## Run in development mode with hot reload (requires air)
 	@if command -v air > /dev/null; then \