fix(homepage): pin UltraSeedbox to one tab, dedupe Uptime Kuma, size columns to members

UltraSeedbox had no layout: entry, and Homepage renders an untabbed group on
every tab — eight full-width bookmark bars repeated four times. Pinned to Main
with a row layout.

Uptime Kuma rendered twice: a manual services.yaml block under Monitoring plus
homepage.group=Apps on the container. Dropped the manual block, moved the
label to Monitoring, added homepage.siteMonitor. Adopted the previously
unmanaged uptimekuma stack into stacks/ so the label is version-controlled.

Column counts declared more columns than groups had members, leaving the last
row of several groups mostly empty. Columns now track member counts.

Also records an UNRESOLVED regression: since the container was recreated the
client render has lost its tab bar, wallpaper and i18n. Ruled out the config
changes (committed pre-cleanup config reproduces it) and v2.0.0 (v1.13.2
reproduces it). Server HTML still carries the tab markup, so the loss is
client-side. Details in the stack README.

stacks/homepage/conf/services.yaml

@@ -7,15 +7,17 @@
 # their own groups through the providers in docker.yaml, so most app
 # entries don't need to appear here.
 
-- Monitoring:
-  # Beszel, Dozzle, Backrest arrive here via Docker label auto-discovery
-  # (homepage.group=Monitoring on their compose files). Do not re-add them
-  # manually — they'll double up in the UI.
-  - Uptime Kuma:
-      href: http://10.0.50.45:3001
-      icon: mdi-check-network
-      siteMonitor: http://10.0.50.45:3001
-      description: Uptime monitor (esh-docker-vm)
+# The Monitoring group is fully Docker-auto-discovered — Beszel, Dozzle,
+# Backrest and Uptime Kuma all carry homepage.group=Monitoring on their
+# compose files. There is deliberately no manual block here.
+#
+# Uptime Kuma used to be listed manually here AND labelled
+# homepage.group=Apps on its container, so it rendered twice — once in
+# Monitoring without its widget, once in Apps with it. Fixed 2026-08-18 by
+# deleting the manual entry and moving the container's label to Monitoring
+# (stacks/uptimekuma/). This is the exact failure the warning below
+# describes; it survived the 2026-08-17 audit because a duplicate reads as
+# two plausible cards rather than as an error.
 
 - Apps:
   # Manual entry — the Booth is a user-level systemd service on nh3-dev