make details for Comic, Artist and Issue clickable, add CustomField to select Comic and Issue

kontor-api/src/db/models/comic.py

@@ -125,6 +125,18 @@ class Issue(Base, BaseMixin):
         return works
 
 
+    def get_artists(self) -> Dict[Any, List[Any]]:
+        works: Dict[Any, List[Any]] = {}
+        for work in self.issue_works:
+            work_type = work.work_type
+            artist = work.artist
+            if work_type in works:
+                works[work_type].append(artist)
+            else:
+                works[work_type] = [artist]
+        return works
+
+
 class Artist(Base, BaseMixin):
     __tablename__ = "artist"
     name: Mapped[str] = mapped_column(nullable=False)