Add Swagger using drf-spectacular

See #146

DRF 3.16 and Django 5.2 are not in drf-spectacular's published
list of supported but here's some sources that give reason to believe
they are supported _in practice_:

* https://github.com/tfranzel/drf-spectacular/issues/1417
* https://github.com/tfranzel/drf-spectacular/issues/1414

projects/api_views.py

@@ -1,5 +1,6 @@
 from django.shortcuts import get_object_or_404
 from rest_framework import viewsets
+from drf_spectacular.utils import extend_schema, OpenApiParameter, OpenApiTypes
 
 from bugsink.api_pagination import AscDescCursorPagination
 from bugsink.api_mixins import ExpandViewSetMixin, AtomicRequestMixin
@@ -33,6 +34,20 @@ class ProjectViewSet(AtomicRequestMixin, ExpandViewSetMixin, viewsets.ModelViewS
     http_method_names = ["get", "post", "patch", "head", "options"]
     pagination_class = ProjectPagination
 
+    @extend_schema(
+        parameters=[
+            OpenApiParameter(
+                name="team",
+                type=OpenApiTypes.UUID,
+                location=OpenApiParameter.QUERY,
+                required=False,
+                description="Optional filter by team UUID.",
+            ),
+        ]
+    )
+    def list(self, request, *args, **kwargs):
+        return super().list(request, *args, **kwargs)
+
     def filter_queryset(self, queryset):
         if self.action != "list":
             return queryset