doc(clients): add MooPoint

Author: sakalys

docs/clients.mdx

@@ -551,6 +551,7 @@ MooPoint is a web-based AI chat platform built for developers and advanced users
 - Accessible from any PC or smartphone—no installation required
 - Choose your preferred LLM provider
 - Supports `SSE`, `Streamable HTTP`, `npx`, and `uvx` MCP servers
+- OAuth and sampling support
 - New features added daily
 
 ### Msty Studio