Unify coordinate systems with canonical WoW world coordinates

Centralizes all coordinate conversions in core/coordinates.hpp with
proper canonical WoW coords (+X=North, +Y=West, +Z=Up). Fixes critical
tile calculation bug that was loading wrong surrounding tiles during
terrain streaming, and fixes position sync sending ADT-raw format
instead of canonical coordinates to the server.

include/rendering/camera_controller.hpp

@@ -31,6 +31,11 @@ public:
 
     void processMouseWheel(float delta);
     void setFollowTarget(glm::vec3* target);
+    void setDefaultSpawn(const glm::vec3& position, float yawDeg, float pitchDeg) {
+        defaultPosition = position;
+        defaultYaw = yawDeg;
+        defaultPitch = pitchDeg;
+    }
 
     void reset();
 

include/rendering/minimap.hpp

@@ -22,7 +22,8 @@ public:
 
     void setTerrainRenderer(TerrainRenderer* tr) { terrainRenderer = tr; }
 
-    void render(const Camera& playerCamera, int screenWidth, int screenHeight);
+    void render(const Camera& playerCamera, const glm::vec3& centerWorldPos,
+                int screenWidth, int screenHeight);
 
     void setEnabled(bool enabled) { this->enabled = enabled; }
     bool isEnabled() const { return enabled; }
@@ -31,7 +32,7 @@ public:
     void setViewRadius(float radius) { viewRadius = radius; }
 
 private:
-    void renderTerrainToFBO(const Camera& playerCamera);
+    void renderTerrainToFBO(const Camera& playerCamera, const glm::vec3& centerWorldPos);
     void renderQuad(int screenWidth, int screenHeight);
 
     TerrainRenderer* terrainRenderer = nullptr;

include/rendering/terrain_manager.hpp

@@ -188,7 +188,7 @@ public:
 
 private:
     /**
-     * Get tile coordinates from world position
+     * Get tile coordinates from GL world position
      */
     TileCoord worldToTile(float worldX, float worldY) const;