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/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "mempalace",
-  "version": "3.0.14",
+  "version": "3.3.0",
   "description": "Give your AI a memory — mine projects and conversations into a searchable palace. 19 MCP tools, auto-save hooks, and guided setup.",
   "author": {
     "name": "milla-jovovich"