Phase 6: security & ops hardening (T6.1-T6.5)

- T6.1: named rate limiters (api-read/api-write/api-auth/api-webhooks),
  applied per module route group with tighter limits on booking/payment
  writes and the KBZ webhook than read-only catalog/routing endpoints.
- T6.2: install spatie/laravel-activitylog; LogsActivity on Booking/
  Payment/Refund status transitions and catalog/pricing admin CRUD
  (EvCompany, Destination, DepartureTimeSlot, EvRoute, RoutePricing).
  New IdentityPlugin with a read-only AuditLogResource gated by
  view_audit_log.
- T6.3: JSON error envelope for api/* in bootstrap/app.php (401/403/404/
  405/429/500 fallback), plus PaymentGatewayException (422 declined /
  502 unavailable).
- T6.4: feature tests proving the FastAPI agent token gets 403 on
  refund/cancel-not-owned and 405 (no write handler) on catalog/routing
  writes.
- T6.5: install gboquizosanchez/filament-log-viewer with a custom
  Filament admin theme (required for its views' Tailwind classes to
  compile), LOG_CHANNEL/FILAMENT_LOG_VIEWER_DRIVER=daily, registered
  under Operations in the sidebar.

252 tests passing.

app-modules/payment/src/Exceptions/PaymentGatewayException.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Modules\Payment\Exceptions;
+
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use RuntimeException;
+
+/**
+ * Carries a gateway's own error code/message for an unexpected failure that
+ * isn't already captured as a typed Failed result (e.g. a malformed
+ * response the gateway strategy can't parse into a PaymentResultData/
+ * RefundResultData). Never allowed to surface as a raw 500 (domain.md §6,
+ * T6.3): a declined/rejected call from the gateway itself is a 422 (client
+ * can retry/fix), an unreachable/misbehaving gateway is a 502.
+ */
+class PaymentGatewayException extends RuntimeException
+{
+    private function __construct(
+        string $message,
+        private readonly int $statusCode,
+        private readonly ?string $gatewayCode = null,
+    ) {
+        parent::__construct($message);
+    }
+
+    /**
+     * The gateway responded but rejected/declined the request — surfaced as
+     * 422 since it's a business outcome the caller can act on.
+     */
+    public static function declined(string $message, ?string $gatewayCode = null): self
+    {
+        return new self($message, 422, $gatewayCode);
+    }
+
+    /**
+     * The gateway didn't respond usefully at all (unreachable, malformed
+     * payload, unexpected HTTP status) — surfaced as 502, our fault for
+     * depending on it, not the caller's.
+     */
+    public static function unavailable(string $message, ?string $gatewayCode = null): self
+    {
+        return new self($message, 502, $gatewayCode);
+    }
+
+    public function render(Request $request): ?JsonResponse
+    {
+        if ($request->expectsJson()) {
+            return response()->json([
+                'message' => $this->getMessage(),
+                'gateway_code' => $this->gatewayCode,
+            ], $this->statusCode);
+        }
+
+        return null;
+    }
+}

app-modules/payment/src/Models/Payment.php

@@ -10,6 +10,8 @@ use Modules\Booking\Models\Booking;
 use Modules\Payment\Database\Factories\PaymentFactory;
 use Modules\Payment\Enums\PaymentMethod;
 use Modules\Payment\Enums\PaymentStatus;
+use Spatie\Activitylog\Models\Concerns\LogsActivity;
+use Spatie\Activitylog\Support\LogOptions;
 
 /**
  * One attempt to pay for a Booking through a gateway — a Booking can have
@@ -19,7 +21,19 @@ use Modules\Payment\Enums\PaymentStatus;
 class Payment extends Model
 {
     /** @use HasFactory<PaymentFactory> */
-    use HasFactory;
+    use HasFactory, LogsActivity;
+
+    /**
+     * Audit trail on status transitions only (domain.md §6; T6.2).
+     */
+    public function getActivitylogOptions(): LogOptions
+    {
+        return LogOptions::defaults()
+            ->logOnly(['status'])
+            ->logOnlyDirty()
+            ->dontLogEmptyChanges()
+            ->useLogName('payment');
+    }
 
     /**
      * @var list<string>

app-modules/payment/src/Models/Refund.php

@@ -8,6 +8,8 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Modules\Payment\Database\Factories\RefundFactory;
 use Modules\Payment\Enums\RefundStatus;
+use Spatie\Activitylog\Models\Concerns\LogsActivity;
+use Spatie\Activitylog\Support\LogOptions;
 
 /**
  * A reversal against a specific successful Payment (not against the Booking
@@ -17,7 +19,19 @@ use Modules\Payment\Enums\RefundStatus;
 class Refund extends Model
 {
     /** @use HasFactory<RefundFactory> */
-    use HasFactory;
+    use HasFactory, LogsActivity;
+
+    /**
+     * Audit trail on status transitions only (domain.md §6; T6.2).
+     */
+    public function getActivitylogOptions(): LogOptions
+    {
+        return LogOptions::defaults()
+            ->logOnly(['status'])
+            ->logOnlyDirty()
+            ->dontLogEmptyChanges()
+            ->useLogName('refund');
+    }
 
     /**
      * @var list<string>