Add nuclear-plugin-discogs to registry

Author: nukeop

plugins.json

@@ -1,5 +1,15 @@
 {
   "$schema": "./schema/plugins.schema.json",
-  "plugins": [],
+  "plugins": [
+    {
+      "id": "nuclear-plugin-discogs",
+      "description": "Fetch artist and album metadata from Discogs",
+      "author": "nukeop",
+      "repo": "NuclearPlayer/nuclear-plugin-discogs",
+      "category": "metadata",
+      "tags": ["discogs", "metadata"],
+      "addedAt": "2026-01-27"
+    }
+  ],
   "version": 1
 }