feat(pet): add Hey Hey chicken pet addon

Tameable white chicken modelled on Hey Hey from Moana — custom plump
geometry, waddly walk/peck animations, hatching egg item, and vanilla
chicken sounds. Mounted on all 4 servers via docker-compose.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

addon/heyhe_pet_RP/manifest.json

@@ -0,0 +1,17 @@
+{
+  "format_version": 2,
+  "header": {
+    "name": "Hey Hey Chicken Pet Resources",
+    "description": "Textures, models, and animations for the Hey Hey chicken pet.",
+    "uuid": "45ec17df-0d84-456f-b2cc-2d990f96e6d5",
+    "version": [1, 0, 0],
+    "min_engine_version": [1, 21, 0]
+  },
+  "modules": [
+    {
+      "type": "resources",
+      "uuid": "0cba3001-7442-4a69-afa2-27b3dfb763c3",
+      "version": [1, 0, 0]
+    }
+  ]
+}