fix(game): initialize AiConfig resource in AiPlugin

Register AiConfig alongside AiStateMachine so the resource is available before
the perception/state-transition systems read it.

apps/game/src/gameplay/ai/mod.rs

@@ -35,7 +35,8 @@ pub struct AiPlugin;
 
 impl Plugin for AiPlugin {
     fn build(&self, app: &mut App) {
-        app.init_resource::<AiStateMachine>()
+        app.init_resource::<AiConfig>()
+            .init_resource::<AiStateMachine>()
             .add_event::<PerceptionEvent>()
             .add_event::<StateTransition>()
             // AI spawning systems - run when entering in-game state