Add teleporter panel and server-compatible coordinate conversions

Teleporter panel (T key) lets the player teleport between Goldshire,
Stormwind Gate, Ironforge, and Westfall in single-player mode. Adds
serverToCanonical/canonicalToServer conversion at the network packet
boundary so positions are compatible with TrinityCore/MaNGOS/AzerothCore
emulator servers.

include/core/spawn_presets.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <glm/glm.hpp>
+
+namespace wowee::core {
+
+struct SpawnPreset {
+    const char* key;
+    const char* label;
+    const char* mapName;        // Map name for ADT paths (e.g., "Azeroth")
+    glm::vec3 spawnCanonical;   // Canonical WoW coords: +X=North, +Y=West, +Z=Up
+    float yawDeg;
+    float pitchDeg;
+};
+
+// Spawn positions in canonical WoW world coordinates (X=north, Y=west, Z=up).
+// Tile is computed from position via: tileN = floor(32 - wowN / 533.33333)
+inline const SpawnPreset SPAWN_PRESETS[] = {
+    {"goldshire",  "Goldshire",      "Azeroth", glm::vec3(   62.0f, -9464.0f, 200.0f), 0.0f, -5.0f},
+    {"stormwind",  "Stormwind Gate", "Azeroth", glm::vec3(  425.0f, -9176.0f, 120.0f), 35.0f, -8.0f},
+    {"ironforge",  "Ironforge",      "Azeroth", glm::vec3( -882.0f, -4981.0f, 510.0f), -20.0f, -8.0f},
+    {"westfall",   "Westfall",       "Azeroth", glm::vec3( 1215.0f,-10440.0f,  80.0f), 10.0f, -8.0f},
+};
+
+inline constexpr int SPAWN_PRESET_COUNT = 4;
+
+} // namespace wowee::core