STATE-WP-0062 T3: Services nav section + First/Self Hosted pages

Replace the single "Services (TPSC)" nav entry with a Services section:
Third Party (existing /tpsc cloud-third-party view), First Party
(/services/first-party — Service Maturity Level + dev-repo columns,
development_type=first_party), and Self Hosted (/services/self-hosted —
self_hosted third-party OSS with upstream/host/runbook). New pages are filtered
views over /services/catalog and degrade to an empty-state if the API is offline.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

dashboard/observablehq.config.js

@@ -34,7 +34,16 @@ export default {
     { name: "Inbox",         path: "/inbox" },
     { name: "Progress",      path: "/progress" },
     { name: "Token Cost",    path: "/token-cost" },
-    { name: "Services (TPSC)", path: "/tpsc" },
+    {
+      name: "Services",
+      collapsible: true,
+      open: false,
+      pages: [
+        { name: "Third Party", path: "/tpsc" },
+        { name: "First Party", path: "/services/first-party" },
+        { name: "Self Hosted", path: "/services/self-hosted" },
+      ],
+    },
     { name: "Todo",          path: "/todo" },
     { name: "Tools & Apps",  path: "/tools" },
     // ── Sections (alphabetical) ───────────────────────────────────────────────