feat(attributes): cliente Fase 1 — sub-modulo ZMMOAttributes + HUD HP/SP

Espelho do AttributeSystem do servidor (Game/MMO/Modules/AttributeSystem).
Sub-modulo C++ Source/ZMMOAttributes/ (Runtime, LoadingPhase=PreDefault)
isolando o cliente do AttributeSystem em pasta propria — pavimentando o
caminho para futuros Inventory/Skills/Combat virem como sub-modulos peer.

Componentes:
  - FZMMOAttributesSnapshot (USTRUCT Blueprint, espelha
    FZeusAttributesPayload do plugin ZeusNetwork)
  - UZMMOAttributeComponent (UActorComponent ligado ao player):
    ApplySnapshot / ApplyHpSpUpdate / NotifyLevelUp + 3 delegates
    dinamicos (OnAttributesChanged / OnHpSpChanged / OnLevelUp) +
    helpers GetHpRatio / GetSpRatio
  - UZMMOAttributeNetworkHandler (UWorldSubsystem): ponte
    UZeusNetworkSubsystem -> componente via lookup por EntityId
  - UZMMOHudHpSpWidget (UUserWidget base): BindWidget (HpBar, SpBar) +
    BindWidgetOptional (HpText, SpText, LevelText). NativeConstruct
    binda nos delegates do componente; NativeDestruct desliga.
    OnSnapshotApplied / OnHpSpDelta (BlueprintNativeEvent) com impl
    C++ atualizando progress bars e textos.

Integracao no PlayerCharacter:
  - CreateDefaultSubobject<UZMMOAttributeComponent> no ctor
  - HudHpSpWidgetClass (TSubclassOf) resolvido via
    ConstructorHelpers::FClassFinder em /Game/ZMMO/UI/HUD/WBP_HUD_HpSpBar
  - HandleLocalSpawnReady seed do EntityId no componente + spawn do HUD
    (CreateWidget + AddToViewport + BindToAttributeComponent)
  - EndPlay remove widget do parent

WBP_HUD_HpSpBar (UMG, criado via MCP):
  - Overlay root + SizeBox (320x120) + VerticalBox
  - 5 widgets BindWidget: LevelText, HpBar (vermelho), HpText,
    SpBar (azul), SpText
  - Herda de UZMMOHudHpSpWidget

Verificacao (smoke test):
  - PIE login -> server envia S_ATTRIBUTE_SNAPSHOT_FULL
  - Cliente recebe via OnAttributeSnapshotFull -> handler roteia pra
    componente do entity -> ApplySnapshot dispara OnAttributesChanged ->
    widget atualiza ProgressBars + TextBlocks
  - HUD aparece no canto inferior esquerdo da tela com valores
    correspondentes ao DB

Refs:
  - Plano: C:/Users/mateu/.claude/plans/temos-uma-lab-input-nested-diffie.md
  - Server companion commit: feat(attributes): AttributeSystem modular

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Source/ZMMOAttributes/Public/ZMMOAttributeNetworkHandler.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Subsystems/WorldSubsystem.h"
+#include "ZeusAttributesPayload.h"
+#include "ZMMOAttributeNetworkHandler.generated.h"
+
+class UZeusNetworkSubsystem;
+
+/**
+ *  Ponte entre o `UZeusNetworkSubsystem` (GameInstanceSubsystem do plugin
+ *  ZeusNetwork) e os `UZMMOAttributeComponent` ligados aos atores do mundo.
+ *
+ *  Por que UWorldSubsystem (e nao GameInstanceSubsystem)?
+ *   - O registry de atores (`UZMMOWorldSubsystem::GetActorByEntityId`) e'
+ *     World-scoped, reset a cada OpenLevel.
+ *   - World subsystem so existe enquanto ha mundo carregado, o que e' exato
+ *     quando precisamos rotear snapshots (no front-end nao ha pawn).
+ *
+ *  Lifecycle: `Initialize` binda nos 3 delegates do ZeusNetworkSubsystem;
+ *  `Deinitialize` unbinda. Conversao `FZeusAttributesPayload ->
+ *  FZMMOAttributesSnapshot` (USTRUCT Blueprint) acontece aqui.
+ */
+UCLASS()
+class ZMMOATTRIBUTES_API UZMMOAttributeNetworkHandler : public UWorldSubsystem
+{
+	GENERATED_BODY()
+
+public:
+	virtual void Initialize(FSubsystemCollectionBase& Collection) override;
+	virtual void Deinitialize() override;
+
+	virtual bool ShouldCreateSubsystem(UObject* Outer) const override;
+
+private:
+	void HandleAttributeSnapshotFull(const FZeusAttributesPayload& Payload);
+	void HandleHpSpUpdate(int32 EntityId, int32 Hp, int32 Sp);
+	void HandleLevelUp(int32 EntityId, int32 NewBaseLevel, int32 StatusPointDelta);
+
+	UZeusNetworkSubsystem* GetZeusNetSubsystem() const;
+
+	FDelegateHandle SnapshotFullHandle;
+	FDelegateHandle HpSpUpdateHandle;
+	FDelegateHandle LevelUpHandle;
+};