Add MLX backend config options

pkg/config/config.go

@@ -10,9 +10,22 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
+// BackendConfig contains backend executable configurations
+type BackendConfig struct {
+	// Path to llama-server executable (llama.cpp backend)
+	LlamaExecutable string `yaml:"llama_executable"`
+
+	// Path to mlx_lm executable (MLX-LM backend)
+	MLXLMExecutable string `yaml:"mlx_lm_executable"`
+
+	// Optional: Default Python virtual environment path for MLX backends
+	MLXPythonPath string `yaml:"mlx_python_path,omitempty"`
+}
+
 // AppConfig represents the configuration for llamactl
 type AppConfig struct {
 	Server     ServerConfig    `yaml:"server"`
+	Backends   BackendConfig   `yaml:"backends"`
 	Instances  InstancesConfig `yaml:"instances"`
 	Auth       AuthConfig      `yaml:"auth"`
 	Version    string          `yaml:"-"`
@@ -112,6 +125,11 @@ func LoadConfig(configPath string) (AppConfig, error) {
 			AllowedOrigins: []string{"*"}, // Default to allow all origins
 			EnableSwagger:  false,
 		},
+		Backends: BackendConfig{
+			LlamaExecutable: "llama-server",
+			MLXLMExecutable: "mlx_lm.server",
+			MLXPythonPath:   "", // Empty means use system Python
+		},
 		Instances: InstancesConfig{
 			PortRange:            [2]int{8000, 9000},
 			DataDir:              getDefaultDataDirectory(),
@@ -229,8 +247,16 @@ func loadEnvVars(cfg *AppConfig) {
 			cfg.Instances.EnableLRUEviction = b
 		}
 	}
+	// Backend config
 	if llamaExec := os.Getenv("LLAMACTL_LLAMA_EXECUTABLE"); llamaExec != "" {
-		cfg.Instances.LlamaExecutable = llamaExec
+		cfg.Backends.LlamaExecutable = llamaExec
+		cfg.Instances.LlamaExecutable = llamaExec // Keep for backward compatibility
+	}
+	if mlxLMExec := os.Getenv("LLAMACTL_MLX_LM_EXECUTABLE"); mlxLMExec != "" {
+		cfg.Backends.MLXLMExecutable = mlxLMExec
+	}
+	if mlxPython := os.Getenv("LLAMACTL_MLX_PYTHON_PATH"); mlxPython != "" {
+		cfg.Backends.MLXPythonPath = mlxPython
 	}
 	if autoRestart := os.Getenv("LLAMACTL_DEFAULT_AUTO_RESTART"); autoRestart != "" {
 		if b, err := strconv.ParseBool(autoRestart); err == nil {