feat(server): add spigot configuration patches and compose updates

- Add .gitignore to exclude 'data' directory
- Update compose.yaml for paper service to mount patches volume and set PATCH_DEFINITIONS env var
- Add timezone mounts to 'paper' and 'backup' services in compose.yaml
- Create patches/spigot.json to patch spigot.yml with custom item-despawn-rate

patches/spigot.json

@@ -0,0 +1,11 @@
+{
+  "file": "/data/spigot.yml",
+  "ops": [
+    {
+      "$set": {
+        "path": "$.world-settings.default.item-despawn-rate",
+        "value": 12000
+      }
+    }
+  ]
+}