homepage: live model info on the fleet cards, user docs page at /docs

- services.json: frank-large/medium/small move from admin-only to the user
  page with current descriptions (halogen w4b iGPU; 35:30 layer-split MTP
  27B on the R9700s; Gemma4-12B QAT vision path on the 3090) and docs
  links to /docs#models
- docs.html: static user documentation (access chain, model guide, media
  how-tos, troubleshooting); served at /docs via the post-auth homepage
  listener; shipped by deploy_homepage; footer + index link to it
- tests: pages seam asserts the docs contract (page, link, Caddy route,
  deployer copy)
- vault: Homepage.md synced (docs landing shipped, cards reclassified)

dankclaw/Caddyfile

@@ -323,6 +323,16 @@ http://:8017 {
 			}
 			respond "Forbidden: homepage admins only" 403
 		}
+		# User docs page (static). Anchors (#models etc.) are client-side,
+		# so both /docs and /docs/ map onto the single docs.html.
+		handle /docs {
+			try_files /docs.html
+			file_server
+		}
+		handle /docs/ {
+			try_files /docs.html
+			file_server
+		}
 		@data path /services.json /status.json /app.js /style.css /deployed.js
 		handle @data {
 			file_server