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

docs/wiki/pages/_Sidebar.md

@@ -0,0 +1,21 @@
+## 🔧 pi_mcps Wiki
+
+### Overview
+- [🏠 Home](Home)
+- [🔌 MCP Servers](MCP-Servers-Overview)
+- [🛠️ Dev Conventions](Development-Conventions)
+
+### MCP Servers
+- [🎨 mcp-image-gen](mcp-image-gen)
+- [⚙️ ComfyUI Setup](mcp-image-gen-ComfyUI-Setup)
+- [🕸️ mcp-webscraper](mcp-webscraper)
+- [🧠 BigMind](BigMind)
+
+### Java Projects
+- [☕ Java Overview](Java-Projects)
+- [🛍️ wellmann-shop](Java-wellmann-shop)
+- [🏢 mss-failsafe](Java-mss-failsafe)
+- [📐 Java Architecture](Java-Architecture)
+
+---
+*[Gitea Repo](http://192.168.188.119:30008/pplate/pi_mcps)*