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 { Reactor_CSTR, Reactor_PFR } = require('./specificClass.js');
+const { configManager } = require('generalFunctions');
 
 
 class nodeClass {
@@ -70,20 +71,10 @@ 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: "reactor" // should be set in config manager
-            },
+        const cfgMgr = new configManager();
+
+        // Build config: base sections + reactor-specific domain config
+        this.config = cfgMgr.buildConfig('reactor', uiConfig, this.node.id, {
             reactor_type: uiConfig.reactor_type,
             volume: parseFloat(uiConfig.volume),
             length: parseFloat(uiConfig.length),
@@ -107,7 +98,7 @@ class nodeClass {
                 parseFloat(uiConfig.X_TS_init)
             ],
             timeStep: parseFloat(uiConfig.timeStep)
-        }
+        });
     }
 
     /**