Add remote instance management functionality and configuration support

pkg/config/config.go

@@ -41,6 +41,7 @@ type AppConfig struct {
 	Backends   BackendConfig   `yaml:"backends"`
 	Instances  InstancesConfig `yaml:"instances"`
 	Auth       AuthConfig      `yaml:"auth"`
+	Nodes      []NodeConfig    `yaml:"nodes,omitempty"`
 	Version    string          `yaml:"-"`
 	CommitHash string          `yaml:"-"`
 	BuildTime  string          `yaml:"-"`
@@ -125,6 +126,12 @@ type AuthConfig struct {
 	ManagementKeys []string `yaml:"management_keys"`
 }
 
+type NodeConfig struct {
+	Name    string `yaml:"name"`
+	Address string `yaml:"address"`
+	APIKey  string `yaml:"api_key,omitempty"`
+}
+
 // LoadConfig loads configuration with the following precedence:
 // 1. Hardcoded defaults
 // 2. Config file