antag objective issuing refactor (#28216)

* add AntagObjectives from GenericAntag

* add AntagRandomObjectives that traitor and thief can use

* make ObjectivesSystem use initial character name which AntagSelection passes

* make thief and traitor use AntagRandomObjectives

* remove now unused locale

* make sleeper agents rule use baseTraitorRule

* restore dragon rule oop

* bandaid for genericantag

* real

* typo

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Antag/AntagObjectivesSystem.cs

@@ -0,0 +1,35 @@
+using Content.Server.Antag.Components;
+using Content.Server.Objectives;
+using Content.Shared.Mind;
+using Content.Shared.Objectives.Systems;
+
+namespace Content.Server.Antag;
+
+/// <summary>
+/// Adds fixed objectives to an antag made with <c>AntagObjectivesComponent</c>.
+/// </summary>
+public sealed class AntagObjectivesSystem : EntitySystem
+{
+    [Dependency] private readonly SharedMindSystem _mind = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<AntagObjectivesComponent, AfterAntagEntitySelectedEvent>(OnAntagSelected);
+    }
+
+    private void OnAntagSelected(Entity<AntagObjectivesComponent> ent, ref AfterAntagEntitySelectedEvent args)
+    {
+        if (!_mind.TryGetMind(args.Session, out var mindId, out var mind))
+        {
+            Log.Error($"Antag {ToPrettyString(args.EntityUid):player} was selected by {ToPrettyString(ent):rule} but had no mind attached!");
+            return;
+        }
+
+        foreach (var id in ent.Comp.Objectives)
+        {
+            _mind.TryAddObjective(mindId, mind, id);
+        }
+    }
+}