feat(cli): add interactive config input and Makefile

- support interactive value input for `config set`
- hide API key input and output
- add Makefile for build, test, vet, coverage, and cleanup
- add golang.org/x/term dependency
- update changelog and gitignore

Makefile

@@ -0,0 +1,43 @@
+.PHONY: all build test vet fmt lint cover install tidy clean help
+
+BINARY   := ry
+MAIN_PKG := ./cmd/ry
+GO       := go
+GOFLAGS  :=
+OUTPUT   := bin/$(BINARY)
+
+VERSION  := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+COMMIT   := $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
+LDFLAGS  := -X main.version=$(VERSION) -X main.commit=$(COMMIT)
+BUILD_FLAGS := -ldflags "$(LDFLAGS)"
+
+all: build
+
+build: ## Build the CLI binary into bin/
+	$(GO) build $(GOFLAGS) $(BUILD_FLAGS) -o $(OUTPUT) $(MAIN_PKG)
+
+install: ## Install the CLI binary to GOPATH/bin
+	$(GO) install $(GOFLAGS) $(BUILD_FLAGS) $(MAIN_PKG)
+
+test: ## Run all tests
+	$(GO) test $(GOFLAGS) -race ./...
+
+vet: ## Run go vet
+	$(GO) vet ./...
+
+fmt: ## Format all Go source files
+	gofmt -s -w .
+	$(GO) mod tidy
+
+cover: ## Run tests with coverage and generate HTML report
+	$(GO) test $(GOFLAGS) -race -coverprofile=coverage.out ./...
+	$(GO) tool cover -html=coverage.out -o coverage.html
+
+tidy: ## Run go mod tidy
+	$(GO) mod tidy
+
+clean: ## Remove build artifacts and coverage files
+	rm -rf bin/ coverage.out coverage.html
+
+help: ## Show this help message
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[36m%-10s\033[0m %s\n", $$1, $$2}'