v0.2.4: verify and declare NetBox 4.7.1 compatibility

Went through NetBox 4.7's release notes for breaking/plugin-relevant
changes and checked each one that could plausibly affect this plugin
against the actual v4.7.1 source rather than assuming:

- Rack.form_factor/width/airflow/outer_* are deprecated (removal
  planned for v5.0) but still present and behave the same - the
  plugin's GEOMETRY_FIELDS copying is unaffected.
- ChoiceSet's CHOICES now accepts a new Choice object, but the
  metaclass explicitly still supports the legacy (value, label, color)
  tuple format this plugin's own choices.py uses - confirmed by
  reading utilities/choices.py's updated register() logic directly.
- register_model_view, ViewTab, get_model_urls, PluginConfig's
  relative resource-path resolution, PortTemplateMapping/
  PortMappingBase (patch panel front/rear sync),
  Cable/CableTermination/CabledObjectModel (rack-import cable copy),
  NetBoxModel/NetBoxModelForm/NetBoxModelFilterSet/NetBoxModelViewSet,
  PluginMenu*, ColorField, DynamicModelChoiceField, TagFilterField,
  CSVChoiceField/CSVModelChoiceField: all unchanged or only gained
  additive mixins.
- django-tables2 v3's removed RelatedLinkColumn and the removed
  querystring tag aren't used anywhere in this plugin. The MPTT->ltree
  migration doesn't touch any model this plugin manipulates directly.

No source changes were required. Raised max_version from 4.6.99 to
4.7.99 to reflect the verified range; left it there rather than
guessing forward to an unreleased 4.8.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

netbox_rack_concept/__init__.py

@@ -1,6 +1,6 @@
 from netbox.plugins import PluginConfig
 
-__version__ = '0.2.3'
+__version__ = '0.2.4'
 
 
 class RackConceptConfig(PluginConfig):
@@ -11,7 +11,12 @@ class RackConceptConfig(PluginConfig):
     author = 'Claude'
     base_url = 'rack-concepts'
     min_version = '4.6.0'
-    max_version = '4.6.99'
+    # Verified against the real 4.7.1 source: RackBase/Rack fields, PortTemplateMapping,
+    # Cable/CableTermination, register_model_view/ViewTab, NetBoxModel*, ChoiceSet
+    # (its CHOICES refactor explicitly keeps supporting the legacy (value, label, color)
+    # tuple format this plugin uses) are all unchanged or additive. No 4.8 exists yet to
+    # verify against, so the ceiling stops at the 4.7 line rather than guessing further.
+    max_version = '4.7.99'
     # These paths are relative to this module (NetBox prepends self.__module__),
     # so they must NOT be prefixed with 'netbox_rack_concept.' again.
     menu = 'navigation.menu'