0.31.1: make dashboard metrics honest

- Container card now compares compose-only counts across hosts: agents
  report compose_running in /agent/system (pre-0.31.1 agents fall back to
  the all-containers number); card retitled, ResourceBar stat labelled
  'Containers (all)'.
- Uptime is sampled every 5 min (background loop + opportunistic on read)
  and charted as daily averages instead of a once-a-day snapshot; no
  sample is written when no compose containers exist (was: fake 100%).
  Legacy daily entries in uptime.jsonl still count; file pruned at startup.
- Funnel stage 'monitored' is now per-stack and real: stacks with an
  enabled local auto-update policy (was: global webhook-exists toggle).
  Frontend label renamed to 'Auto-managed'.

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

frontend/src/pages/Dashboard.tsx

@@ -207,7 +207,7 @@ const FUNNEL_STAGES = [
   { key: "running", label: "Running" },
   { key: "healthy", label: "Healthy" },
   { key: "updated", label: "Up to date" },
-  { key: "monitored", label: "Monitored" },
+  { key: "monitored", label: "Auto-managed" },
 ] as const;
 
 function StackHealthCard({
@@ -302,14 +302,19 @@ function ContainerCountCard({
 
   const hosts: { name: string; count: number }[] = [
     { name: "local", count: localRunning ?? 0 },
-    ...online.map((a, i) => ({ name: a.name, count: remote[i].data?.containers_running ?? 0 })),
+    // compose_running keeps the bars comparable with the local compose-only
+    // count; pre-0.31.1 agents only report the all-containers number.
+    ...online.map((a, i) => ({
+      name: a.name,
+      count: remote[i].data?.compose_running ?? remote[i].data?.containers_running ?? 0,
+    })),
   ];
   const total = hosts.reduce((s, h) => s + h.count, 0);
   const max = Math.max(...hosts.map((h) => h.count), 1);
 
   return (
     <div className="sp-card sp-rise flex flex-col p-5 sm:p-6" style={{ animationDelay: "60ms" }}>
-      <h2 className="sp-label">Containers running</h2>
+      <h2 className="sp-label">Compose containers running</h2>
       {loading ? (
         <div className="mt-3 space-y-3">
           <div className="sp-skeleton h-14 w-28" />
@@ -379,7 +384,9 @@ function UptimeCard({
           <UptimeChart data={values} />
         )}
       </div>
-      <p className="mt-2 text-xs text-sp-text-3">Daily share of compose containers running, this host.</p>
+      <p className="mt-2 text-xs text-sp-text-3">
+        Share of compose containers running on this host, sampled every 5 min (daily average).
+      </p>
     </div>
   );
 }
@@ -552,7 +559,7 @@ function ResourceBar({
       />
       <Stat
         icon={<Container className="h-5 w-5" />}
-        label="Containers"
+        label="Containers (all)"
         value={`${containersRunning} / ${containersTotal}`}
       />
       <Stat icon={<Server className="h-5 w-5" />} label="Docker" value={dockerVersion || "—"} />