Remove legacy map handling, implement VMap and MMap systems

- Remove all legacy MangosSharp map format handling from TMapTile
  and WS_Maps, making GridMap (MangosZero format) the sole map reader
- Remove legacy arrays (ZCoord, AreaFlag, AreaTerrain, WaterLevel),
  legacy resolution config (RESOLUTION_ZMAP), legacy interpolation,
  and legacy filename format (D3/XY -> D4/YX MangosZero format)
- Implement VMap system for line-of-sight and collision detection:
  - BIH (Bounding Interval Hierarchy) spatial acceleration structure
  - WorldModel/GroupModel with Moller-Trumbore triangle intersection
  - ModelInstance with world-to-model coordinate transforms
  - StaticMapTree for per-map model instance management
  - VMapManager for LoS, height, and hit-position queries
- Implement MMap pathfinding system using Detour navmesh:
  - DtNavMesh with tile loading and polygon spatial queries
  - DtNavMeshQuery with FindNearestPoly, FindPath, FindStraightPath
  - PathInfo for high-level pathfinding requests
  - MMapManager for navmesh tile loading and path computation
- Wire VMap/MMap into WS_Maps: IsInLineOfSight, GetVMapHeight,
  and GetObjectHitPos now delegate to VMapManager when enabled
- Clean up MapFileFormats: remove GetLegacyMapFileName

https://claude.ai/code/session_0194PFFCeXmh82deGbisQtP2

Author: claude

src/server/Mangos.World/Handlers/WS_CharMovement.cs

@@ -917,11 +917,11 @@ public void UpdateCell(ref WS_PlayerData.CharacterObject Character)
         }
         short CellXAdd = -1;
         short CellYAdd = -1;
-        if (WorldServiceLocator.WSMaps.GetSubMapTileX(Character.positionX) > 32)
+        if (WorldServiceLocator.WSMaps.GetSubTileFraction(Character.positionX) > 0.5f)
         {
             CellXAdd = 1;
         }
-        if (WorldServiceLocator.WSMaps.GetSubMapTileX(Character.positionY) > 32)
+        if (WorldServiceLocator.WSMaps.GetSubTileFraction(Character.positionY) > 0.5f)
         {
             CellYAdd = 1;
         }