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/game/opcodes.hpp

@@ -236,6 +236,15 @@ enum class Opcode : uint16_t {
     // ---- Death/Respawn ----
     CMSG_REPOP_REQUEST               = 0x015A,
     CMSG_SPIRIT_HEALER_ACTIVATE      = 0x0176,
+
+    // ---- Teleport / Transfer ----
+    MSG_MOVE_TELEPORT_ACK            = 0x0C7,
+    SMSG_TRANSFER_PENDING            = 0x003F,
+
+    // ---- Taxi / Flight Paths ----
+    SMSG_SHOWTAXINODES               = 0x01A9,
+    SMSG_ACTIVATETAXIREPLY           = 0x01AE,
+    CMSG_ACTIVATETAXIEXPRESS         = 0x0312,
 };
 
 } // namespace game