fix: prevent metric charts from freezing when navigating with wire:navigate

Wraps inline chart initialization scripts in IIFEs to create local scope for variables. This prevents "Identifier has already been declared" errors when Livewire's SPA navigation re-executes scripts, allowing smooth navigation between metrics pages without page refresh.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

app/Traits/HasMetrics.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace App\Traits;
+
+trait HasMetrics
+{
+    public function getCpuMetrics(int $mins = 5): ?array
+    {
+        return $this->getMetrics('cpu', $mins, 'percent');
+    }
+
+    public function getMemoryMetrics(int $mins = 5): ?array
+    {
+        $field = $this->isServerMetrics() ? 'usedPercent' : 'used';
+
+        return $this->getMetrics('memory', $mins, $field);
+    }
+
+    private function getMetrics(string $type, int $mins, string $valueField): ?array
+    {
+        $server = $this->getMetricsServer();
+        if (! $server->isMetricsEnabled()) {
+            return null;
+        }
+
+        $from = now()->subMinutes($mins)->toIso8601ZuluString();
+        $endpoint = $this->getMetricsEndpoint($type, $from);
+
+        $response = instant_remote_process(
+            ["docker exec coolify-sentinel sh -c 'curl -H \"Authorization: Bearer {$server->settings->sentinel_token}\" {$endpoint}'"],
+            $server,
+            false
+        );
+
+        if (str($response)->contains('error')) {
+            $error = json_decode($response, true);
+            $error = data_get($error, 'error', 'Something is not okay, are you okay?');
+            if ($error === 'Unauthorized') {
+                $error = 'Unauthorized, please check your metrics token or restart Sentinel to set a new token.';
+            }
+            throw new \Exception($error);
+        }
+
+        $metrics = collect(json_decode($response, true))->map(function ($metric) use ($valueField) {
+            return [(int) $metric['time'], (float) ($metric[$valueField] ?? 0.0)];
+        })->toArray();
+
+        if ($mins > 60 && count($metrics) > 1000) {
+            $metrics = downsampleLTTB($metrics, 1000);
+        }
+
+        return $metrics;
+    }
+
+    private function isServerMetrics(): bool
+    {
+        return $this instanceof \App\Models\Server;
+    }
+
+    private function getMetricsServer(): \App\Models\Server
+    {
+        return $this->isServerMetrics() ? $this : $this->destination->server;
+    }
+
+    private function getMetricsEndpoint(string $type, string $from): string
+    {
+        $base = 'http://localhost:8888/api';
+        if ($this->isServerMetrics()) {
+            return "{$base}/{$type}/history?from={$from}";
+        }
+
+        return "{$base}/container/{$this->uuid}/{$type}/history?from={$from}";
+    }
+}