Bump version to 1.5.0 with comprehensive documentation and plugin system

Major features and improvements:
- Fix critical guide template variable replacement bug
- Complete guide documentation rewrite with examples
- Implement plugin system with HTMLBlock and MQTTTracker plugins
- Enhanced bilingual support (NL/EN) throughout the system
- Improved template system with better layout options
- Enhanced security headers and code quality
- Updated documentation and configuration examples

Version 1.5.0 represents a significant milestone with improved
documentation, plugin architecture, and bug fixes.

version.php

@@ -6,12 +6,26 @@
  */
 
 return [
-    'version' => '1.0.0',
-    'release_date' => '2025-11-24',
-    'codename' => 'Stable',
+    'version' => '1.5.0',
+    'release_date' => '2025-11-26',
+    'codename' => 'Enhanced',
     'status' => 'stable',
-    
+
     'changelog' => [
+        '1.5.0' => [
+            'date' => '2025-11-26',
+            'changes' => [
+                'Fix critical guide template variable replacement bug',
+                'Complete guide documentation rewrite with comprehensive examples',
+                'Implement plugin system with HTMLBlock and MQTTTracker plugins',
+                'Enhanced bilingual support (NL/EN) throughout the system',
+                'Improved template system with better layout options',
+                'Enhanced security headers and code quality improvements',
+                'Updated documentation and configuration examples',
+                'Plugin architecture for extensibility',
+                'Real-time analytics and tracking capabilities',
+            ]
+        ],
         '1.0.0' => [
             'date' => '2025-11-24',
             'changes' => [