uptime-kuma: annotate config and drop the unused collection

lucasheld.uptime_kuma was pinned but never used - every monitor was created by
hand-rolled Python. The uptime subdomain stays because the deprecated blocks
still template it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ansible/requirements.yml

@@ -1,11 +1,10 @@
----
 # Ansible Galaxy Collections Requirements
 # Install with: ansible-galaxy collection install -r requirements.yml
 
-collections:
-  # Uptime Kuma Ansible Collection
-  # Used by: infra/41_disk_usage_alerts.yml
-  # Provides modules to manage Uptime Kuma monitors programmatically
-  - name: lucasheld.uptime_kuma
-    version: ">=1.0.0"
+# No collections are currently required.
+#
+# lucasheld.uptime_kuma was pinned here but never used — every monitor was created
+# by hand-rolled Python instead. Removed 2026-09-11 along with Uptime Kuma itself.
+# See archive/uptime_kuma/.
 
+collections: []