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/wmo_renderer.hpp

@@ -203,6 +203,12 @@ public:
      */
     bool isInsideWMO(float glX, float glY, float glZ, uint32_t* outModelId = nullptr) const;
 
+    /**
+     * Check if a position is inside an interior WMO group (flag 0x2000).
+     * Used to dim M2 lighting for doodads placed indoors.
+     */
+    bool isInsideInteriorWMO(float glX, float glY, float glZ) const;
+
     /**
      * Raycast against WMO bounding boxes for camera collision
      * @param origin Ray origin (e.g., character head position)