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/deploy.sh

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+#!/bin/bash
+set -e
+VPS="uroma2@95.216.124.247"
+echo "Uploading backend..."
+scp /opt/blog/wiki-vector-chat.py "$VPS:/opt/blog/"
+echo "Uploading frontend..."
+scp /opt/zportal/chat.html "$VPS:/opt/zportal/chat.html"
+echo "Restarting service..."
+ssh "$VPS" "sudo systemctl restart wiki-vector-chat"
+sleep 2
+echo "Checking health..."
+ssh "$VPS" "curl -s http://127.0.0.1:8770/health"
+echo ""
+echo "Deploy complete!"

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

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+#!/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 ""