feat: complete email infrastructure with queue, templates, logging, and API

Adds the full transactional email system:
- Redis queue (QUEUE_CONNECTION=redis), SES config in .env.example
- 3 migrations: organisation_email_settings, organisation_email_templates, email_logs
- EmailTemplateType and EmailLogStatus enums with Dutch defaults
- EmailService as central entry point for all email sending
- SendTransactionalEmail queued job with retries and idempotency
- TransactionalMail mailable with responsive HTML + plain text templates
- Organisation-level branding (colors, logo, footer, reply-to)
- Per-type template overrides with {variable} substitution
- Email log with filtering by status, type, date range, recipient
- Preview and send-test endpoints for template management
- API endpoints: email-settings, email-templates (CRUD), email-logs (read-only)
- Integrated into existing flows: invitations, password reset, email
  verification, registration approval/rejection
- 37 new tests across 4 test files, all existing tests updated

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/Http/Resources/Api/V1/EmailLogResource.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Resources\Api\V1;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+final class EmailLogResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'recipient_email' => $this->recipient_email,
+            'recipient_name' => $this->recipient_name,
+            'template_type' => $this->template_type->value,
+            'template_label' => $this->template_type->label(),
+            'subject' => $this->subject,
+            'status' => $this->status->value,
+            'error_message' => $this->error_message,
+            'queued_at' => $this->queued_at?->toIso8601String(),
+            'sent_at' => $this->sent_at?->toIso8601String(),
+            'failed_at' => $this->failed_at?->toIso8601String(),
+            'triggered_by' => $this->whenLoaded('triggeredBy', fn () => [
+                'id' => $this->triggeredBy->id,
+                'name' => $this->triggeredBy->first_name . ' ' . $this->triggeredBy->last_name,
+            ]),
+            'event_id' => $this->event_id,
+            'person_id' => $this->person_id,
+            'created_at' => $this->created_at->toIso8601String(),
+        ];
+    }
+}

api/app/Http/Resources/Api/V1/EmailSettingsResource.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Resources\Api\V1;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+final class EmailSettingsResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'organisation_id' => $this->organisation_id,
+            'logo_url' => $this->logo_url,
+            'primary_color' => $this->primary_color,
+            'secondary_color' => $this->secondary_color,
+            'footer_text' => $this->footer_text,
+            'reply_to_email' => $this->reply_to_email,
+            'reply_to_name' => $this->reply_to_name,
+            'created_at' => $this->created_at->toIso8601String(),
+            'updated_at' => $this->updated_at->toIso8601String(),
+        ];
+    }
+}

api/app/Http/Resources/Api/V1/EmailTemplateResource.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Resources\Api\V1;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+final class EmailTemplateResource extends JsonResource
+{
+    /**
+     * @param  Request  $request
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        // This resource handles both Eloquent models and raw arrays from EmailService
+        if (is_array($this->resource)) {
+            return $this->resource;
+        }
+
+        return [
+            'id' => $this->id,
+            'organisation_id' => $this->organisation_id,
+            'type' => $this->type instanceof \App\Enums\EmailTemplateType ? $this->type->value : $this->type,
+            'label' => $this->type instanceof \App\Enums\EmailTemplateType ? $this->type->label() : $this->type,
+            'subject' => $this->subject,
+            'heading' => $this->heading,
+            'body_text' => $this->body_text,
+            'button_text' => $this->button_text,
+            'is_custom' => true,
+            'created_at' => $this->created_at->toIso8601String(),
+            'updated_at' => $this->updated_at->toIso8601String(),
+        ];
+    }
+}