feat(cmd/ry): add simplified single-provider config

cmd/ry/internal/config/config.go

@@ -0,0 +1,53 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/BurntSushi/toml"
+)
+
+type Config struct {
+	APIKey string `toml:"api_key,omitempty"`
+	Output string `toml:"output"`
+}
+
+func Load(path string) (*Config, error) {
+	cfg := &Config{Output: "table"}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return cfg, nil
+		}
+		return nil, err
+	}
+	if err := toml.Unmarshal(data, cfg); err != nil {
+		return nil, err
+	}
+	if cfg.Output == "" {
+		cfg.Output = "table"
+	}
+	return cfg, nil
+}
+
+func Save(path string, cfg *Config) error {
+	dir := filepath.Dir(path)
+	if err := os.MkdirAll(dir, 0700); err != nil {
+		return err
+	}
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	enc := toml.NewEncoder(f)
+	return enc.Encode(cfg)
+}
+
+func DefaultPath() string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "config.toml"
+	}
+	return filepath.Join(home, ".config", "ry", "config.toml")
+}