chore(profiles): bump SDKs and add changelog for user profiles v1

Python mem0ai 2.0.20 -> 2.1.0, TypeScript mem0ai 3.1.8 -> 3.2.0 (minor: new
user-profiles methods). Add matching sdk.mdx entries under the Python and
TypeScript tabs to satisfy the changelog CI gate.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mem0ai"
-version = "2.0.20"
+version = "2.1.0"
 description = "Long-term memory for AI Agents"
 authors = [
     { name = "Mem0", email = "support@mem0.ai" }