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)

shared/homepage/style.css

@@ -77,6 +77,16 @@ body::before {
 }
 .foot a { color: var(--link); text-decoration: none; }
 
+/* The user docs page (static prose). */
+.docs { max-width: 780px; }
+.docs h1 { color: var(--head); font-size: 1.25rem; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
+.docs h2 { color: var(--head); font-size: 1.05rem; margin-top: 20px; }
+.docs a { color: var(--link); }
+.docs code { color: var(--head); }
+.docs .foot-note { color: var(--dim); }
+html[data-bare="1"] .docs h1, html[data-bare="1"] .docs h2 { color: #000; border-color: #000; }
+html[data-bare="1"] .docs a, html[data-bare="1"] .docs code { color: #000; }
+
 /* Bare mode (Q27): strip to default browser rendering. */
 html[data-bare="1"] body { background: #fff; color: #000; font-family: serif; text-shadow: none; font-size: 16px; }
 html[data-bare="1"] body::before { display: none; }