Migrate _loadConfig to use ConfigManager.buildConfig()

Replaces manual base config construction with shared buildConfig() method.
Node now only specifies domain-specific config sections.

Part of #1: Extract base config schema

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

src/nodeClass.js

@@ -1,4 +1,5 @@
 const { Settler } = require('./specificClass.js');
+const { configManager } = require('generalFunctions');
 
 
 class nodeClass {
@@ -54,21 +55,8 @@ class nodeClass {
    * @param {object} uiConfig Config set in UI in node-red
    */
   _loadConfig(uiConfig) {
-    this.config = {
-      general: {
-        name: uiConfig.name || this.name,
-        id: this.node.id,
-        unit: null,
-        logging: {
-          enabled: uiConfig.enableLog,
-          logLevel: uiConfig.logLevel
-        }
-      },
-      functionality: {
-        positionVsParent: uiConfig.positionVsParent || 'atEquipment', // Default to 'atEquipment' if not specified
-        softwareType: "settler" // should be set in config manager
-      }
-    }
+    const cfgMgr = new configManager();
+    this.config = cfgMgr.buildConfig('settler', uiConfig, this.node.id);
   }
 
   /**