feat(verification): 教練審核流程完整版——狀態機/證照送審/Admin 裁決/通知

實作 openspec change provider-verification-workflow（25/25 tasks）：
- is_verified 升級為 verification_status 四狀態機（unsubmitted/pending/
  approved/rejected），migration 自動轉換既有資料，API 以 accessor 保留
  is_verified 相容輸出
- 教練端：證照上傳（≤3 張、複用 CompressesImages）、送審、駁回原因
  顯示與重送（/coach/verification 新頁面）
- Admin 端：審核佇列、通過/駁回（原因必填）、撤銷 approved；移除
  toggle-verified 端點（防繞過狀態機）；裁決後 flush 課程快取
- 通知：審核通過/駁回（站內+Email，駁回含原因）
- 可見性與預約入口改判 approved（行為等價）
- 測試 +18（ProviderVerificationTest 10、AdminVerificationTest 8），
  既有 4 個測試檔 helper 遷移；Swagger 同步
- 規格同步：provider-verification 全面改寫、admin-user-management
  toggle 段落改為移除聲明

容器內全套件 173 passed / 439 assertions。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/Notifications/ProviderVerificationApprovedNotification.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Notifications;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class ProviderVerificationApprovedNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    public int $tries = 3;
+
+    public function via(object $notifiable): array
+    {
+        return ['database', 'mail'];
+    }
+
+    public function toArray(object $notifiable): array
+    {
+        return [
+            'type'         => 'verification_approved',
+            'title'        => '審核通過',
+            'body'         => '恭喜！你的教練資格已通過平台審核，課程現在會公開曝光並可接受預約。',
+            'action_url'   => config('app.frontend_url') . '/coach/dashboard',
+            'related_id'   => $notifiable->id,
+            'related_type' => 'provider_verification',
+        ];
+    }
+
+    public function toMail(object $notifiable): MailMessage
+    {
+        return (new MailMessage)
+            ->subject('教練資格審核通過 — CFDivePlatform')
+            ->greeting('恭喜！')
+            ->line('你的教練資格已通過平台審核。')
+            ->line('你的課程現在會公開曝光，並可開始接受會員預約。')
+            ->action('前往教練後台', config('app.frontend_url') . '/coach/dashboard');
+    }
+}

app/Notifications/ProviderVerificationRejectedNotification.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Notifications;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class ProviderVerificationRejectedNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    public int $tries = 3;
+
+    public function __construct(public readonly string $reason) {}
+
+    public function via(object $notifiable): array
+    {
+        return ['database', 'mail'];
+    }
+
+    public function toArray(object $notifiable): array
+    {
+        return [
+            'type'         => 'verification_rejected',
+            'title'        => '審核未通過',
+            'body'         => "你的教練資格審核未通過。原因：{$this->reason}",
+            'action_url'   => config('app.frontend_url') . '/coach/verification',
+            'related_id'   => $notifiable->id,
+            'related_type' => 'provider_verification',
+        ];
+    }
+
+    public function toMail(object $notifiable): MailMessage
+    {
+        return (new MailMessage)
+            ->subject('教練資格審核結果 — CFDivePlatform')
+            ->greeting('審核結果通知')
+            ->line('很抱歉，你的教練資格審核未通過。')
+            ->line("原因：{$this->reason}")
+            ->line('你可以補正資料與證照後重新送審。')
+            ->action('重新送審', config('app.frontend_url') . '/coach/verification');
+    }
+}