refactor: SentryEventScrubber static + config array notation

The scrubber is fully stateless. Container-resolution per event was
overhead without value, the closure indirection polluted the config
layer with executable logic, and stack traces showed an anonymous
closure frame instead of the class name.

- SentryEventScrubber::scrub() and its private helpers all become
  static methods. No instance fields, so the change is mechanical.
- config/sentry.php before_send switches from a closure that calls
  app() to PHP array-callable notation [Class, method]. Symfony
  OptionsResolver accepts array-callables for static methods.
- PiiScrubbingTest swaps (new SentryEventScrubber)->scrub(...) for
  SentryEventScrubber::scrub(...). Semantics unchanged.

Tests 1537 unchanged. Larastan and Pint clean.

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

api/app/Services/Observability/SentryEventScrubber.php

@@ -44,7 +44,7 @@ final class SentryEventScrubber
 
     private const MAX_DEPTH = 10;
 
-    public function scrub(Event $event, ?EventHint $hint = null): ?Event
+    public static function scrub(Event $event, ?EventHint $hint = null): ?Event
     {
         if ($hint?->exception instanceof HttpException && $hint->exception->getStatusCode() < 500) {
             return null;
@@ -54,9 +54,9 @@ final class SentryEventScrubber
 
         if ($request !== []) {
             $event->setRequest(array_merge($request, [
-                'data' => $this->scrubBody($request['data'] ?? []),
-                'headers' => $this->scrubHeaders($request['headers'] ?? []),
-                'query_string' => $this->scrubQueryString($request['query_string'] ?? ''),
+                'data' => self::scrubBody($request['data'] ?? []),
+                'headers' => self::scrubHeaders($request['headers'] ?? []),
+                'query_string' => self::scrubQueryString($request['query_string'] ?? ''),
                 'cookies' => self::SCRUBBED,
             ]));
         }
@@ -68,7 +68,7 @@ final class SentryEventScrubber
      * @param  mixed  $data
      * @return mixed
      */
-    private function scrubBody($data, int $depth = 0)
+    private static function scrubBody($data, int $depth = 0)
     {
         if (! is_array($data)) {
             return $data;
@@ -92,7 +92,7 @@ final class SentryEventScrubber
             }
 
             if (is_array($value)) {
-                $data[$key] = $this->scrubBody($value, $depth + 1);
+                $data[$key] = self::scrubBody($value, $depth + 1);
             }
         }
 
@@ -103,7 +103,7 @@ final class SentryEventScrubber
      * @param  array<string, mixed>|string  $headers
      * @return array<string, mixed>|string
      */
-    private function scrubHeaders($headers)
+    private static function scrubHeaders($headers)
     {
         if (! is_array($headers)) {
             return $headers;
@@ -118,7 +118,7 @@ final class SentryEventScrubber
         return $headers;
     }
 
-    private function scrubQueryString(string $queryString): string
+    private static function scrubQueryString(string $queryString): string
     {
         if ($queryString === '') {
             return '';