Add Wiki VectorDB Chat skill

Multi-provider AI chat with RAG pipeline for Z.ai portal.
Includes SKILL.md, deploy and health-check scripts.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

skills/wiki-vector-chat/scripts/health-check.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+VPS="uroma2@95.216.124.247"
+echo "=== Service Status ==="
+ssh "$VPS" "sudo systemctl status wiki-vector-chat --no-pager -l" 2>&1 | head -15
+echo ""
+echo "=== Health ==="
+ssh "$VPS" "curl -s http://127.0.0.1:8770/health"
+echo ""
+echo ""
+echo "=== Providers ==="
+ssh "$VPS" "curl -s http://127.0.0.1:8770/providers"
+echo ""