chore: bump plugin manifests to 3.3.0 and fix owner URL

Aligns marketplace.json and both plugin.json files with version.py /
pyproject.toml (already at 3.3.0) so `/plugin update` reflects the
v3.1.0/v3.2.0/v3.3.0 tags that had been landing without manifest bumps.

Also updates marketplace.json `owner.url` from the stale
github.com/milla-jovovich path to the current github.com/MemPalace org.

Refs #874

.claude-plugin/marketplace.json

@@ -2,14 +2,14 @@
   "name": "mempalace",
   "owner": {
     "name": "milla-jovovich",
-    "url": "https://github.com/milla-jovovich"
+    "url": "https://github.com/MemPalace"
   },
   "plugins": [
     {
       "name": "mempalace",
       "source": "./.claude-plugin",
       "description": "AI memory system — mine projects and conversations into a searchable palace. 19 MCP tools, auto-save hooks, guided setup.",
-      "version": "3.0.14",
+      "version": "3.3.0",
       "author": {
         "name": "milla-jovovich"
       }