feat: add multi-world hub system with lobby portals and hub-return addon

Lobby addon detects players in portal zones at X: -15/0/15 and transfers
them to Jamie/Lyla/Mya survival worlds. Hub-return addon gives players a
recovery compass and chat commands (!hub, !lobby) to return to the lobby.

Includes docker-compose.yml for 4 Bedrock servers (lobby + 3 child worlds),
spark pet behavior/resource packs, and updated .gitignore.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

addon/spark_pet_RP/render_controllers/dragon_egg.render_controllers.json

@@ -0,0 +1,14 @@
+{
+  "format_version": "1.8.0",
+  "render_controllers": {
+    "controller.render.dragon_egg": {
+      "geometry": "Geometry.default",
+      "materials": [
+        {
+          "*": "Material.default"
+        }
+      ],
+      "textures": ["Texture.default"]
+    }
+  }
+}

addon/spark_pet_RP/render_controllers/dragon_gravestone.render_controllers.json

@@ -0,0 +1,14 @@
+{
+  "format_version": "1.8.0",
+  "render_controllers": {
+    "controller.render.dragon_gravestone": {
+      "geometry": "Geometry.default",
+      "materials": [
+        {
+          "*": "Material.default"
+        }
+      ],
+      "textures": ["Texture.default"]
+    }
+  }
+}

addon/spark_pet_RP/render_controllers/dragon_toy.render_controllers.json

@@ -0,0 +1,14 @@
+{
+  "format_version": "1.8.0",
+  "render_controllers": {
+    "controller.render.dragon_toy": {
+      "geometry": "Geometry.default",
+      "materials": [
+        {
+          "*": "Material.default"
+        }
+      ],
+      "textures": ["Texture.default"]
+    }
+  }
+}

addon/spark_pet_RP/render_controllers/spark_dragon.render_controllers.json

@@ -0,0 +1,14 @@
+{
+  "format_version": "1.8.0",
+  "render_controllers": {
+    "controller.render.spark_dragon": {
+      "geometry": "Geometry.default",
+      "materials": [
+        {
+          "*": "Material.default"
+        }
+      ],
+      "textures": ["Texture.default"]
+    }
+  }
+}