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

src/rendering/renderer.cpp

@@ -185,6 +185,9 @@ bool Renderer::initialize(core::Window* win) {
 
     // Create M2 renderer (for doodads)
     m2Renderer = std::make_unique<M2Renderer>();
+    if (wmoRenderer) {
+        m2Renderer->setWMORenderer(wmoRenderer.get());
+    }
     // Note: M2 renderer needs asset manager, will be initialized when terrain loads
 
     // Create zone manager