Standardize softwareType to lowercase everywhere

- ConfigManager.buildConfig() now lowercases softwareType
- Updated config JSON defaults to lowercase
- childRegistrationUtils lowercases softwareType on extraction
- Closes #8

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

src/helper/childRegistrationUtils.js

@@ -6,7 +6,7 @@ class ChildRegistrationUtils {
   }
 
   async registerChild(child, positionVsParent, distance) {
-    const { softwareType } = child.config.functionality;
+    const softwareType = (child.config.functionality.softwareType || '').toLowerCase();
     const { name, id } = child.config.general;
 
     this.logger.debug(`Registering child: ${name} (${id}) as ${softwareType} at ${positionVsParent}`);

src/helper/validationUtils.js

@@ -295,7 +295,7 @@ class ValidationUtils {
                 value.y = uniqueY;
             }
             // Validate that y values are numbers
-            else if (!this.areNumbers(value.y)) {
+            if (!this.areNumbers(value.y)) {
                 this.logger.warn(`Dimension '${name}' key '${key}' has non-numeric y values. Ignoring this key.`);
                 return false;
             }