Simplify character dossier fields, add ShowPronouns setting

Collapse Want/Need into Motivation and Internal/External Conflict into
Conflict, drop Arc summary field, and move tags below open questions on
the character page. Gate Pronouns display behind new UiSettings:ShowPronouns
config (default off).

tests/Novelly.Api.Tests/CharacterServiceTests.cs

@@ -48,23 +48,23 @@ public class CharacterServiceTests : ServiceTestFixture
     public async Task Updating_leaves_omitted_fields_alone_and_clears_on_empty_string()
     {
         var character = await Characters.CreateAsync(_novelId, new CreateCharacterRequest(
-            "Ines", Want: "To find her sister.", Need: "To let go of the guilt."));
+            "Ines", Motivation: "To find her sister.", Conflict: "Torn between vengeance and letting go."));
 
         var renamed = (await Characters.UpdateAsync(character.Id, new UpdateCharacterRequest(Name: "Ines Vell")))!;
 
         Assert.Multiple(() =>
         {
             Assert.That(renamed.Name, Is.EqualTo("Ines Vell"));
-            Assert.That(renamed.Want, Is.EqualTo("To find her sister."));
-            Assert.That(renamed.Need, Is.EqualTo("To let go of the guilt."));
+            Assert.That(renamed.Motivation, Is.EqualTo("To find her sister."));
+            Assert.That(renamed.Conflict, Is.EqualTo("Torn between vengeance and letting go."));
         });
 
-        var cleared = (await Characters.UpdateAsync(character.Id, new UpdateCharacterRequest(Need: "")))!;
+        var cleared = (await Characters.UpdateAsync(character.Id, new UpdateCharacterRequest(Conflict: "")))!;
 
         Assert.Multiple(() =>
         {
-            Assert.That(cleared.Need, Is.Null);
-            Assert.That(cleared.Want, Is.EqualTo("To find her sister."));
+            Assert.That(cleared.Conflict, Is.Null);
+            Assert.That(cleared.Motivation, Is.EqualTo("To find her sister."));
         });
     }