feat: finish the homepage plugin, move service links and canvas out of core (B19)

plugins/homepage/CHANGELOG.md

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+# Changelog
+
+## 1.0.0
+
+Bundled with Termix 2.9.0.
+
+- Homepage and the dashboard's service links moved out of core's own
+  servers on ports 30006 (dashboard) and 30012 (homepage), and now serve
+  under `/plugin-api/homepage`.
+- Owns its data: core's `homepage_items`, `homepage_layouts` and
+  `dashboard_service_links` tables are renamed to `p_homepage_*` on first
+  activation.
+- The favicon, RSS, ping and custom-API outbound requests now go through
+  `ctx.fetch` instead of a raw fetch, keeping the same SSRF guard.
+- New `homepage.use` permission, given to the admin and user roles.
+- Offers `homepage.items` v1 to other plugins; the AI assistant reads it
+  optionally.
+- The dashboard's "Dashboard / Homepage" toggle is now a contribution to
+  core's generic `dashboard.secondaryView` slot rather than a hardcoded
+  homepage case.
+- Core's uptime, recent-activity and database-health routes stayed on the
+  main server, now under `/dashboard` rather than a dedicated port.