chore(release): sync 3.3.4 version bump back into develop

The v3.3.4 release prep landed on main but was never merged back into
develop, leaving every version-bearing file one release behind. Bumps
pyproject.toml, mempalace/version.py, both plugin manifests, the
marketplace entry, the README badge, and the lockfile to 3.3.4 to match
the tagged release.

uv.lock

@@ -1169,7 +1169,7 @@ wheels = [
 
 [[package]]
 name = "mempalace"
-version = "3.3.3"
+version = "3.3.4"
 source = { editable = "." }
 dependencies = [
     { name = "chromadb" },