Update README: Proxmox integration is now built

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -35,14 +35,18 @@ Built so far:
 - **Integrations → Semaphore** — Ansible run status per template across
   every project, with a "Run" action to trigger a template; a live
   template-count widget (with a last-failed warning) on the Dashboard.
+- **Integrations → Proxmox** — VM/LXC status across every node in the
+  cluster, with start/stop/restart actions; a live running/total widget on
+  the Dashboard. Supports self-signed certificates (common in homelab
+  Proxmox setups).
 
-All four integrations follow the same config-in-UI + encrypted-credentials
-pattern as DNS providers, so the remaining ones slot into the same
-"Add integration" form as they're built.
+All five integrations follow the same config-in-UI + encrypted-credentials
+pattern as DNS providers, so the remaining one slots into the same
+"Add integration" form once built.
 
 Not yet built (see `.claude/plans` for the full delivery plan):
 
-- Remaining live integrations: Proxmox, Synology
+- Remaining live integration: Synology
 
 ## Requirements