feat: add remote NodeService client backed by the HTTP API

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

service/config_file.go

@@ -14,6 +14,7 @@ type fileConfig struct {
 	User        string       `json:"user"`
 	UserAliases []*Alias     `json:"aliases"`
 	Serve       ServerConfig `json:"serve"`
+	Remote      ServerConfig `json:"remote"`
 }
 
 var defaultAliases = []*Alias{
@@ -141,6 +142,17 @@ func (c *fileConfig) ListAliases() ([]*Alias, error) {
 	return result, nil
 }
 
+func (c *fileConfig) GetRemoteConfig() (ServerConfig, bool) {
+	if c.Remote.Host == "" {
+		return ServerConfig{}, false
+	}
+	port := c.Remote.Port
+	if port == 0 {
+		port = 7000
+	}
+	return ServerConfig{Host: c.Remote.Host, Port: port}, true
+}
+
 func (c *fileConfig) GetServerConfig() ServerConfig {
 	host := c.Serve.Host
 	if host == "" {