Add HLOD system with tree-based LOD selection

[Copilot]

Implements a hierarchical level-of-detail system following the engine's feature processor / renderer / component architecture.

Core (runtime/render/core/include/render/hlod/)

• HLODNode — LOD node with switch distances, AABB bounds, mesh ref, and parent/child indices
• HLODTree — Recursive camera-distance LOD selector; traverses from roots, switching to children when inside switchInDistance, culling beyond switchOutDistance
• HLODRenderer — Tracks active node set; rebuilds render primitives only when selection changes
• HLODFeatureProcessor / HLODFeature — Standard feature processor + singleton registration, mirrors MeshFeatureProcessor / MeshFeature

Adaptor (runtime/render/adaptor/)

• HLODComponent — World component wired to TransformComponent + main camera position for per-tick LOD evaluation
• RenderModule — Registered component, feature init, and shutdown

Usage

auto *tree = new HLODTree();

HLODNode root;
root.switchInDistance = 500.f;
root.mesh = coarseMesh;
uint32_t rootIdx = tree->AddNode(root);

HLODNode child;
child.parentIndex = rootIdx;
child.switchInDistance = 100.f;
child.mesh = detailedMesh;
tree->AddNode(child);

// Attach to actor via component
auto *hlod = actor->AddComponent<HLODComponent>();
hlod->SetHLODTree(tree);

No CMakeLists changes needed — both RenderCore and RenderAdaptor use GLOB_RECURSE.

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