feat(logs): structured cron run history + read endpoint

Adds unifi_cron_runs table (one row per scheduled-task execution) and
UnifiCronRun::record() wrapper that captures start/finish/status and
exceptions. The three scheduled commands now write through it:

  - reboot-all-aps    → rebooted/failed AP names per run
  - rotate-passwords  → rotated SSIDs + PPSKs, failures (when actually
                        rotating; the "is it due" early-return is silent
                        so we don't flood the log with no-op rows every
                        minute)
  - sync-ppsk-schedules → enabled/disabled PPSKs (silent when there's
                          no work)

UnifiCronLogsController returns the most-recent 200 runs as JSON,
filterable by command + status. Behind permission:unifi.settings; no
super-admin required — read-only history is fine for any operator
who can see settings.

v1.5.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Http/Controllers/UnifiCronLogsController.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Dashboard\Unifi\Http\Controllers;
+
+use Dashboard\Unifi\Models\UnifiCronRun;
+use Illuminate\Http\Request;
+use Illuminate\Routing\Controller;
+
+class UnifiCronLogsController extends Controller
+{
+    public function index(Request $request)
+    {
+        $filters = $request->only(['command', 'status']);
+
+        $runs = UnifiCronRun::query()
+            ->with('triggeredByUser:id,name,email')
+            ->when($filters['command'] ?? null, fn ($q, $c) => $q->where('command', $c))
+            ->when($filters['status']  ?? null, fn ($q, $s) => $q->where('status',  $s))
+            ->orderByDesc('started_at')
+            ->limit(200)
+            ->get();
+
+        return response()->json([
+            'runs' => $runs->map(fn ($r) => [
+                'id'             => $r->id,
+                'command'        => $r->command,
+                'triggered_by'   => $r->triggered_by,
+                'triggered_user' => $r->triggeredByUser ? [
+                    'id'    => $r->triggeredByUser->id,
+                    'name'  => $r->triggeredByUser->name,
+                    'email' => $r->triggeredByUser->email,
+                ] : null,
+                'started_at'     => $r->started_at?->toIso8601String(),
+                'finished_at'    => $r->finished_at?->toIso8601String(),
+                'duration_ms'    => $r->finished_at && $r->started_at
+                    ? (int) $r->finished_at->diffInMilliseconds($r->started_at)
+                    : null,
+                'status'         => $r->status,
+                'details'        => $r->details,
+            ])->values(),
+        ]);
+    }
+}