fix: configure CI database connection properly

- Add dotenv loading to Django settings
- Update CI workflow to use correct environment variables
- Set POSTGRES_* variables instead of DATABASE_URL
- Add environment variables to all Django management commands
- Fixes CI test failures due to database connection issues

app/templates/stiftung/land_form.html

@@ -1,5 +1,6 @@
 {% extends 'base.html' %}
 {% load static %}
+{% load help_tags %}
 
 {% block title %}{{ title }} - Stiftungsverwaltung{% endblock %}
 
@@ -19,8 +20,12 @@
                     </a>
                 </div>
             </div>
+        </div>
+    </div>
 
-            <!-- Form -->
+    <!-- Form -->
+    <div class="row">
+        <div class="col-lg-8">
             <div class="card shadow">
                 <div class="card-header py-3">
                     <h6 class="m-0 font-weight-bold text-primary">
@@ -414,6 +419,11 @@
                 </div>
             </div>
         </div>
+                
+        <!-- Sidebar mit Hilfe -->
+        <div class="col-lg-4">
+            {% help_box 'laenderei_new' user %}
+        </div>
     </div>
 
 {% endblock %}