refactor: integrate diagnostics into Commandocentrum and split EmulatorUpdateService

- Add DiagnosticRunner integration to Commandocentrum for system health display
- Refactor EmulatorUpdateService from 2524 lines to 395 lines (facade pattern)
- Extract EmulatorStatusService, EmulatorJarService, EmulatorSourceService
- Extract EmulatorBuildService, EmulatorSqlService, EmulatorBackupService
- Add shared EmulatorConfiguration trait for dependency injection
- Preserve backward compatibility on all public methods

app/Services/Diagnostics/DiagnosticResult.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Services\Diagnostics;
+
+class DiagnosticResult
+{
+    public function __construct(
+        public readonly string $name,
+        public readonly string $status = 'ok',
+        public readonly string $message = '',
+        public readonly ?string $fix = null,
+    ) {}
+
+    public static function ok(string $name, string $message = ''): self
+    {
+        return new self($name, 'ok', $message);
+    }
+
+    public static function warning(string $name, string $message, ?string $fix = null): self
+    {
+        return new self($name, 'warning', $message, $fix);
+    }
+
+    public static function error(string $name, string $message, ?string $fix = null): self
+    {
+        return new self($name, 'error', $message, $fix);
+    }
+}