VVE - Fixed Water Drive & Bridges

Allows Vanilla Vehicles Expanded land vehicles to drive over heavy bridges and shallow water. Mechanical vehicles lose VVE's blanket Water-tag restriction; deep water remains blocked by vanilla passability. All loaded bridge terrains are detected dynamically, so optional bridge mods no longer cause missing TerrainDef errors. Uses Vehicle Framework's normal map-load grid regeneration and includes an ordering rule for Lockable doors.