Add taxi system, fix WMO interior lighting, ramp collision, and /unstuck

- Implement flight path system: SMSG_SHOWTAXINODES parser, CMSG_ACTIVATETAXIEXPRESS builder, BFS multi-hop pathfinding through TaxiNodes/TaxiPath DBC, taxi destination UI, movement blocking during flight
- Fix WMO interiors too dark by boosting vertex color lighting multiplier
- Dim M2 objects inside WMO interiors (rugs, furniture) via per-instance interior detection
- Fix ramp/stair clipping by lowering wall collision normal threshold from 0.85 to 0.55
- Restore 5-sample cardinal footprint for ground detection to fix rug slipping
- Fix /unstuck command to reset player Z to WMO/terrain floor height
- Handle MSG_MOVE_TELEPORT_ACK and SMSG_TRANSFER_PENDING for hearthstone teleports
- Fix spawning under Stormwind with online-mode camera controller reset

include/rendering/m2_renderer.hpp

@@ -22,6 +22,7 @@ namespace rendering {
 
 class Shader;
 class Camera;
+class WMORenderer;
 
 /**
  * GPU representation of an M2 model
@@ -276,7 +277,10 @@ public:
     }
     void clearShadowMap() { shadowEnabled = false; }
 
+    void setWMORenderer(WMORenderer* wmo) { wmoRenderer = wmo; }
+
 private:
+    WMORenderer* wmoRenderer = nullptr;
     pipeline::AssetManager* assetManager = nullptr;
     std::unique_ptr<Shader> shader;