Pruefzaehler + Pruefkontingent (Decision-Update Phase-2 vorgezogen)

Eigener Pruef-Zaehler, getrennt von der Credit-Wallet (Paragraph 4.2/4.3):

- review_checks Ledger (eine Zeile je Pruefung, source free|credit,
  charged_credits), aggregiert pro Account/Monat statt pro PM
- ReviewCheckService: Tageslimit (harte Bremse, nicht freikaufbar) ->
  Monats-Freikontingent (tier-gestaffelt 4/12/30/60/120) -> Overflow
  zieht 1 Credit/Pruefung aus der Wallet
- ReviewLimitException fuer das erreichte Tageslimit

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Models/ReviewCheck.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\ReviewCheckSource;
+use App\Services\PressRelease\ReviewCheckService;
+use Database\Factories\ReviewCheckFactory;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * Eine verbrauchte Prüfung. Schreibzugriffe laufen über
+ * {@see ReviewCheckService}.
+ */
+class ReviewCheck extends Model
+{
+    /** @use HasFactory<ReviewCheckFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'user_id',
+        'press_release_id',
+        'source',
+        'charged_credits',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'source' => ReviewCheckSource::class,
+            'charged_credits' => 'integer',
+        ];
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function pressRelease(): BelongsTo
+    {
+        return $this->belongsTo(PressRelease::class);
+    }
+
+    /**
+     * Prüfungen im laufenden Kalendermonat (Aggregat pro Account).
+     */
+    public function scopeThisMonth(Builder $query): Builder
+    {
+        return $query->where('created_at', '>=', now()->startOfMonth());
+    }
+
+    /**
+     * Prüfungen am heutigen Tag (Burst-/Tageslimit).
+     */
+    public function scopeToday(Builder $query): Builder
+    {
+        return $query->where('created_at', '>=', now()->startOfDay());
+    }
+}