docs(wiki): add IX hosting server system article + radio site infra

- New wiki/systems/ix-server.md: IX web host (172.16.3.10) facts, the
  ACG hosted sites table, and a full record of radio.azcomputerguru.com
  (Astro static + React 19 islands; source in projects/radio-show/website/;
  build npm run build -> dist -> rsync to cPanel doc root).
- index.md: list the new IX systems article.
- radio-show.md: fix the stale "ix-server.md may not exist" backlink.
- memory reference_radio_website.md: add stack detail (React islands,
  wavesurfer/fuse, node>=22) + pointer to the new wiki article.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/memory/reference_radio_website.md

@@ -7,12 +7,14 @@ type: reference
 ## Radio Show Website
 
 - **URL:** https://radio.azcomputerguru.com
-- **Platform:** Astro 6.0.4 (static site generator)
+- **Platform:** Astro 6.0.4 (`output: 'static'`) with **React 19 islands** (`@astrojs/react`), MDX, sitemap, RSS; `wavesurfer.js` (episode audio) + `fuse.js` (client search). Node >= 22.12.0.
 - **Server:** IX server (172.16.3.10), cPanel account `azcomputerguru`
 - **Document Root:** `/home/azcomputerguru/public_html/radio`
-- **Source Code:** `projects/radio-show/website/` in ClaudeTools repo
+- **Source Code:** `projects/radio-show/website/` in ClaudeTools repo (server holds only built `dist/`)
+- **Content:** Markdown/MDX collections at `src/content/episodes/` and `src/content/blog/`
 - **Build:** `cd projects/radio-show/website && npm run build` produces `dist/` folder
 - **Deploy:** rsync/SCP `dist/` contents to document root on IX server
+- **Full infra record:** `wiki/systems/ix-server.md`. human-flow can AST-scan the `.tsx` islands under `src/components`, not the `.astro` pages.
 
 ### Community Link
 - The community page (`/community`) links to: