feat(sentinel): deduplicate metrics push processing

Move Sentinel push handling into a controller and dispatch server update jobs only when container state changes or the force interval elapses. Add opt-in PostgreSQL read/write replica configuration and tune periodic proxy network and storage checks to reduce unnecessary work.

Add feature coverage for replica config, Sentinel push deduplication, deployment log scrolling, and server update job optimizations.

app/Jobs/PushServerUpdateJob.php

@@ -127,15 +127,20 @@ class PushServerUpdateJob implements ShouldBeEncrypted, ShouldQueue, Silenced
         }
         $data = collect($this->data);
 
-        $this->server->sentinelHeartbeat();
-
+        // Heartbeat is updated by SentinelController on every push, before dispatch.
         $this->containers = collect(data_get($data, 'containers'));
         $filesystemUsageRoot = data_get($data, 'filesystem_usage_root.used_percentage');
 
-        // Only dispatch storage check when disk percentage actually changes
+        // Only dispatch the storage check when disk usage is at/above the notification
+        // threshold AND the value changed. Below the threshold ServerStorageCheckJob
+        // has nothing to do (it only sends a HighDiskUsage notification), so dispatching
+        // it is wasted work — and most servers sit well below the threshold.
+        $diskThreshold = data_get($this->server, 'settings.server_disk_usage_notification_threshold', 80);
         $storageCacheKey = 'storage-check:'.$this->server->id;
         $lastPercentage = Cache::get($storageCacheKey);
-        if ($lastPercentage === null || (string) $lastPercentage !== (string) $filesystemUsageRoot) {
+        if ($filesystemUsageRoot !== null
+            && $filesystemUsageRoot >= $diskThreshold
+            && (string) $lastPercentage !== (string) $filesystemUsageRoot) {
             Cache::put($storageCacheKey, $filesystemUsageRoot, 600);
             ServerStorageCheckJob::dispatch($this->server, $filesystemUsageRoot);
         }
@@ -500,11 +505,11 @@ class PushServerUpdateJob implements ShouldBeEncrypted, ShouldQueue, Silenced
                 } catch (\Throwable $e) {
                 }
             } else {
-                // Connect proxy to networks periodically (every 10 min) to avoid excessive job dispatches.
+                // Connect proxy to networks periodically as a safety net to avoid excessive job dispatches.
                 // On-demand triggers (new network, service deploy) use dispatchSync() and bypass this.
                 $proxyCacheKey = 'connect-proxy:'.$this->server->id;
                 if (! Cache::has($proxyCacheKey)) {
-                    Cache::put($proxyCacheKey, true, 600);
+                    Cache::put($proxyCacheKey, true, config('constants.proxy.connect_networks_interval_seconds', 3600));
                     ConnectProxyToNetworksJob::dispatch($this->server);
                 }
             }