feat: manage branding profiles in the NetBox UI

New BrandingProfile model (migration 0001) with logo upload, color
pickers, font, Word template upload, table style and extra CSS, plus
list/edit/delete views, an HTML preview and a menu entry with add
button. Access is controlled via the model's Django permissions.

Profiles from the database are offered first in the export form (the
default profile preselected); profiles from PLUGINS_CONFIG still work.

Bump version to 0.2.0 - requires "manage.py migrate".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

netbox_customer_export/branding.py

@@ -36,8 +36,8 @@ def _normalize(profile):
     return profile
 
 
-def get_brandings():
-    """Alle Profile als {key: dict}. Top-Level-Einstellungen gelten als Basis für jedes Profil."""
+def _config_brandings():
+    """Profile aus PLUGINS_CONFIG. Top-Level-Einstellungen gelten als Basis für jedes Profil."""
     base = dict(DEFAULT_BRANDING)
     for key in DEFAULT_BRANDING:
         value = get_plugin_config(PLUGIN, key)
@@ -49,6 +49,31 @@ def get_brandings():
     return {key: _normalize({**base, "name": key, **profile}) for key, profile in profiles.items()}
 
 
+def _db_brandings():
+    """In NetBox gepflegte Profile; das Standardprofil zuerst."""
+    from django.db import DatabaseError
+
+    from .models import BrandingProfile
+
+    try:
+        return {f"db-{p.pk}": _normalize(p.as_branding()) for p in BrandingProfile.objects.all()}
+    except DatabaseError:  # Migration noch nicht ausgeführt
+        return {}
+
+
+def get_brandings():
+    """Alle Profile als {key: dict}: zuerst die aus NetBox, dann die aus der Konfiguration.
+
+    Sobald es Profile in NetBox gibt, entfällt das implizite Konfigurations-Profil "default"
+    (nur Top-Level-Werte, kein "brandings"), damit die Auswahl nicht doppelt ist.
+    """
+    db = _db_brandings()
+    config = _config_brandings()
+    if db and not get_plugin_config(PLUGIN, "brandings"):
+        config = {}
+    return {**db, **config}
+
+
 def get_branding(key=None):
     brandings = get_brandings()
     return brandings.get(key) or next(iter(brandings.values()))