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/src/services/self-hosted.md

@@ -0,0 +1,48 @@
+---
+title: Self Hosted Services
+---
+
+# Self Hosted Services Catalog
+
+Services and webapps built on **third-party / open-source software** that coulomb
+**hosts and operates** as part of the three-helix infrastructure
+(`hosting_type = self_hosted`, `development_type = third_party`). coulomb runs
+these but is not development-responsible for them.
+
+> First-party services that coulomb also self-hosts (e.g. the State Hub itself)
+> are listed under [First Party](/services/first-party), classified by who develops
+> them.
+
+```js
+import {API} from "../components/config.js";
+```
+
+```js
+const services = await fetch(`${API}/services/catalog?hosting_type=self_hosted&development_type=third_party`)
+  .then(r => r.ok ? r.json() : [])
+  .catch(() => []);
+```
+
+```js
+const rows = services.map(s => ({
+  Service: s.name,
+  Slug: s.slug,
+  "Upstream OSS": s.self_hosted?.upstream_oss_project ?? s.owner_or_provider ?? "—",
+  "Helix Instance": s.self_hosted?.helix_instance ?? "—",
+  Host: s.self_hosted?.host_node ?? "—",
+  Runbook: s.self_hosted?.runbook_ref ?? "—",
+  Status: s.status,
+}));
+```
+
+```js
+display(services.length === 0
+  ? html`<div style="color:#64748b;padding:1rem;">No self-hosted third-party services registered yet. Add one with
+      <code>POST /services/catalog</code> (<code>hosting_type: "self_hosted"</code>,
+      <code>development_type: "third_party"</code>).</div>`
+  : Inputs.table(rows, {
+      columns: ["Service", "Upstream OSS", "Helix Instance", "Host", "Runbook", "Status"],
+      sort: "Service",
+      rows: 30,
+    }));
+```