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/renderer.hpp

@@ -31,6 +31,7 @@ class LightingManager;
 class SkySystem;
 class SwimEffects;
 class MountDust;
+class LevelUpEffect;
 class CharacterRenderer;
 class WMORenderer;
 class M2Renderer;
@@ -122,6 +123,7 @@ public:
 
     // Emote support
     void playEmote(const std::string& emoteName);
+    void triggerLevelUpEffect(const glm::vec3& position);
     void cancelEmote();
     bool isEmoteActive() const { return emoteActive; }
     static std::string getEmoteText(const std::string& emoteName, const std::string* targetName = nullptr);
@@ -186,6 +188,7 @@ private:
     std::unique_ptr<SkySystem> skySystem;  // Coordinator for sky rendering
     std::unique_ptr<SwimEffects> swimEffects;
     std::unique_ptr<MountDust> mountDust;
+    std::unique_ptr<LevelUpEffect> levelUpEffect;
     std::unique_ptr<CharacterRenderer> characterRenderer;
     std::unique_ptr<WMORenderer> wmoRenderer;
     std::unique_ptr<M2Renderer> m2Renderer;