Add Geschichte (History) wiki-style feature with reorganized navigation

🆕 NEW FEATURES:
- Wiki-style Geschichte (History) section with rich text editor
- Image upload support for history pages
- Quill.js rich text editor with formatting options
- Slug-based URLs for SEO-friendly history pages
- Image galleries with descriptions and alt-text support

🔧 MODELS:
- GeschichteSeite: Main history pages with rich content
- GeschichteBild: Image attachments for history pages
- Auto-generated slugs, sorting, publishing controls

📝 TEMPLATES:
- geschichte/liste.html: Card-based overview of all history pages
- geschichte/detail.html: Full page view with image gallery
- geschichte/form.html: Rich text editor for creating/editing pages
- geschichte/bild_form.html: Image upload interface

🎨 UI IMPROVEMENTS:
- Reorganized navigation menu into logical groups:
  * Menschen & Finanzen (People & Finance)
  * Immobilien & Land (Real Estate & Land)
  * Verwaltung (Administration)
  * Geschichte (History)
- More compact menu design saving horizontal space
- Better grouping with dropdown headers

🛠️ TECHNICAL:
- Rich text editor with Quill.js integration
- Image upload with validation and optimization
- Permission-based access controls
- Responsive design for all screen sizes
- Proper breadcrumb navigation
- Auto-slug generation from titles

app/stiftung/migrations/0037_add_geschichte_models.py

@@ -0,0 +1,56 @@
+# Generated by Django 5.0.6 on 2025-10-02 19:48
+
+import django.db.models.deletion
+import uuid
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stiftung', '0036_force_semester_deadlines_update'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='GeschichteSeite',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('titel', models.CharField(max_length=200, verbose_name='Titel')),
+                ('slug', models.SlugField(max_length=200, unique=True, verbose_name='URL-Slug')),
+                ('inhalt', models.TextField(verbose_name='Inhalt')),
+                ('erstellt_am', models.DateTimeField(auto_now_add=True, verbose_name='Erstellt am')),
+                ('aktualisiert_am', models.DateTimeField(auto_now=True, verbose_name='Aktualisiert am')),
+                ('ist_veroeffentlicht', models.BooleanField(default=True, verbose_name='Veröffentlicht')),
+                ('sortierung', models.IntegerField(default=0, verbose_name='Sortierung')),
+                ('aktualisiert_von', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='geschichte_seiten_aktualisiert', to=settings.AUTH_USER_MODEL, verbose_name='Aktualisiert von')),
+                ('erstellt_von', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='geschichte_seiten_erstellt', to=settings.AUTH_USER_MODEL, verbose_name='Erstellt von')),
+            ],
+            options={
+                'verbose_name': 'Geschichte Seite',
+                'verbose_name_plural': 'Geschichte Seiten',
+                'ordering': ['sortierung', 'titel'],
+            },
+        ),
+        migrations.CreateModel(
+            name='GeschichteBild',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('titel', models.CharField(max_length=200, verbose_name='Bildtitel')),
+                ('bild', models.ImageField(upload_to='geschichte/bilder/%Y/%m/', verbose_name='Bild')),
+                ('beschreibung', models.TextField(blank=True, verbose_name='Beschreibung')),
+                ('alt_text', models.CharField(blank=True, max_length=200, verbose_name='Alt-Text')),
+                ('hochgeladen_am', models.DateTimeField(auto_now_add=True, verbose_name='Hochgeladen am')),
+                ('sortierung', models.IntegerField(default=0, verbose_name='Sortierung')),
+                ('hochgeladen_von', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to=settings.AUTH_USER_MODEL, verbose_name='Hochgeladen von')),
+                ('seite', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='bilder', to='stiftung.geschichteseite', verbose_name='Geschichte Seite')),
+            ],
+            options={
+                'verbose_name': 'Geschichte Bild',
+                'verbose_name_plural': 'Geschichte Bilder',
+                'ordering': ['sortierung', 'titel'],
+            },
+        ),
+    ]