Enhance module management: add inventory module support in settings, update templates and app logic for module access control, and extend tenant management script for module configuration

Web/templates/base.html

@@ -1010,14 +1010,18 @@
     <div class="module-selector-bar" id="moduleBar">
         <span class="module-label">Module:</span>
         <div class="module-tabs">
+            {% if inventory_module_enabled %}
             <a href="{{ url_for('home') }}" 
                class="module-tab {% if CURRENT_MODULE == 'inventory' %}active{% endif %}" 
                id="inventoryModule" 
                data-module="inventory">
                📦 Inventarsystem
             </a>
-            {% if library_module_enabled %}
+            {% endif %}
+            {% if inventory_module_enabled and library_module_enabled %}
             <div class="module-separator"></div>
+            {% endif %}
+            {% if library_module_enabled %}
             <a href="{{ url_for('library_view') }}" 
                class="module-tab {% if CURRENT_MODULE == 'library' %}active{% endif %}" 
                id="libraryModule" 
@@ -1028,7 +1032,7 @@
         </div>
     </div>
     {% endif %}
-    {% if CURRENT_MODULE != 'library' %}
+    {% if CURRENT_MODULE != 'library' and inventory_module_enabled %}
     <nav class="navbar navbar-expand-lg navbar-dark" id="inventoryNavbar">
         <div class="container-fluid">
             <a class="navbar-brand" href="{{ url_for('home') }}" data-icon="📦">Inventarsystem</a>