Add 3D level-up effect using LevelUp.m2 spell model

Replace 2D screen-space ding rings with real WoW LevelUp.m2 particle/geometry
effect. Fix FBlock particle color parsing (C3Vector floats, not CImVector bytes)
which was producing blue/red instead of golden yellow. Spell effect models bypass
particle dampeners, glow sprite conversion, Mod→Additive blend override, and all
collision (floor/wall/camera) to prevent camera zoom-in. Other players' level-ups
trigger the 3D effect at their position with group chat notification. F7 hotkey
for testing.

include/rendering/levelup_effect.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <glm/glm.hpp>
+#include <cstdint>
+#include <vector>
+
+namespace wowee {
+namespace rendering {
+
+class M2Renderer;
+
+/// Manages spawning the real LevelUp.m2 spell effect at world positions.
+/// The M2 model contains particle emitters that produce the golden pillar/ring effect.
+class LevelUpEffect {
+public:
+    LevelUpEffect();
+    ~LevelUpEffect();
+
+    /// Load the LevelUp.m2 model (call once after M2Renderer is ready)
+    /// @param m2Renderer The M2 renderer to register the model with
+    /// @param m2FileData Raw bytes of Spell/LevelUp/LevelUp.m2
+    /// @param skinFileData Raw bytes of Spell/LevelUp/LevelUp00.skin
+    /// @return true if model loaded successfully
+    bool loadModel(M2Renderer* m2Renderer,
+                   const std::vector<uint8_t>& m2FileData,
+                   const std::vector<uint8_t>& skinFileData);
+
+    /// Trigger the level-up effect at a world position (render coords)
+    void trigger(const glm::vec3& position);
+
+    /// Remove expired effect instances
+    void update(float deltaTime);
+
+    bool isModelLoaded() const { return modelLoaded_; }
+
+private:
+    static constexpr float EFFECT_DURATION = 3.5f;
+    static constexpr uint32_t MODEL_ID = 999900;  // Unique model ID for level-up effect
+
+    struct ActiveEffect {
+        uint32_t instanceId;
+        float elapsed;
+    };
+
+    M2Renderer* m2Renderer_ = nullptr;
+    bool modelLoaded_ = false;
+    std::vector<ActiveEffect> activeEffects_;
+};
+
+} // namespace rendering
+} // namespace wowee