docs(wiki): migrate to git-based workflow with persistent wiki/ clone

- Extract all wiki content from create_wiki_pages.py into docs/wiki/pages/*.md
- Add docs/wiki/deploy_wiki.sh: copies pages to wiki/ repo, commits, pushes
- Add /wiki/ to .gitignore (anchored — does not affect docs/wiki/)
- 12 pages: Home, MCP-Servers-Overview, mcp-image-gen, ComfyUI-Setup,
  mcp-webscraper (8 tools incl. search_hint), BigMind (schema v8),
  Development-Conventions, Java-Projects, Java-wellmann-shop,
  Java-mss-failsafe, Java-Architecture, _Sidebar
- Workflow: edit docs/wiki/pages/*.md → ./docs/wiki/deploy_wiki.sh

.gitignore

@@ -72,3 +72,10 @@ Thumbs.db
 
 # ── Logs ──────────────────────────────────────────────────────────────────────
 *.log
+
+# ── Wiki (separate git repo — local clone of pi_mcps.wiki.git) ────────────────
+# Edit pages in docs/wiki/pages/*.md (tracked here in pi_mcps).
+# Clone with: git clone http://pplate:TOKEN@192.168.188.119:30008/pplate/pi_mcps.wiki.git wiki/
+# Deploy with: ./docs/wiki/deploy_wiki.sh
+# Note: /wiki/ is anchored to root so docs/wiki/ (source files) is NOT ignored.
+/wiki/