fix(village-evolution): bind-mount enabled_packs.json for persistent pack activation

BDS reads pack activation from LevelDB, not world_behavior_packs.json.
The enabled_packs.json in config/default/ is the correct mechanism to
activate new packs in existing worlds. Bind-mounted so it survives
container recreates via CI/CD.

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

village-evolution-addon/enabled_packs.json

@@ -0,0 +1,6 @@
+{
+  "behavior_packs": [
+    {"pack_id": "c7e91f32-4a8b-4d6e-b21c-9f3a05d8e047", "version": [1, 0, 0]}
+  ],
+  "resource_packs": []
+}