Add transport system, fix NPC spawning, and improve water rendering

Transport System (Phases 1-7):
- Implement TransportManager with Catmull-Rom spline path interpolation
- Add WMO dynamic transforms for moving transport instances
- Implement player attachment via world position composition
- Add test transport with circular path around Stormwind harbor
- Add /transport board and /transport leave console commands
- Reuse taxi flight spline system and external follow camera mode

NPC Spawn Fixes:
- Add smart ocean spawn filter: blocks land creatures at high altitude over water (Z>50)
- Allow legitimate water creatures at sea level (Z≤50) to spawn correctly
- Fixes Elder Grey Bears, Highland Striders, and Plainscreepers spawning over ocean
- Snap online creatures to terrain height when valid ground exists

NpcManager Removal:
- Remove deprecated NpcManager (offline mode no longer supported)
- Delete npc_manager.hpp and npc_manager.cpp
- Simplify NPC animation callbacks to use only creatureInstances_ map
- Move NPC callbacks to game initialization in application.cpp

Water Rendering:
- Fix tile seam gaps caused by per-vertex wave randomization
- Add distance-based blending: seamless waves up close (<150u), grid effect far away (>400u)
- Smooth transition between seamless and grid modes (150-400 unit range)
- Preserves aesthetic grid pattern at horizon while eliminating gaps when swimming

CMakeLists.txt

@@ -88,6 +88,7 @@ set(WOWEE_SOURCES
 
     # Game
     src/game/game_handler.cpp
+    src/game/transport_manager.cpp
     src/game/world.cpp
     src/game/player.cpp
     src/game/entity.cpp
@@ -95,7 +96,6 @@ set(WOWEE_SOURCES
     src/game/world_packets.cpp
     src/game/character.cpp
     src/game/zone_manager.cpp
-    src/game/npc_manager.cpp
     src/game/inventory.cpp
 
     # Audio
@@ -199,7 +199,6 @@ set(WOWEE_HEADERS
     include/game/entity.hpp
     include/game/opcodes.hpp
     include/game/zone_manager.hpp
-    include/game/npc_manager.hpp
     include/game/inventory.hpp
     include/game/spell_defines.hpp
     include/game/group_defines.hpp