feat: 添加 Laravel Sanctum 支持，增强管理员 API 鉴权，更新相关中间件与路由配置

app/Http/Controllers/Api/V1/Admin/Auth/CaptchaController.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Admin\Auth;
+
+use App\Services\AdminCaptchaService;
+use App\Support\ApiResponse;
+use Illuminate\Http\JsonResponse;
+
+/**
+ * GET /api/v1/admin/auth/captcha
+ *
+ * 返回一次性验证码 Key 与 SVG（Base64 便于前台直接赋值给 img.src）。
+ */
+final class CaptchaController
+{
+    public function __invoke(AdminCaptchaService $captcha): JsonResponse
+    {
+        $payload = $captcha->create();
+
+        return ApiResponse::success([
+            'captcha_key' => $payload['captcha_key'],
+            'image_base64' => $payload['image_base64'],
+        ]);
+    }
+}

app/Http/Controllers/Api/V1/Admin/Auth/LoginController.php

@@ -0,0 +1,88 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Admin\Auth;
+
+use App\Lottery\ErrorCode;
+use App\Models\AdminUser;
+use App\Services\AdminCaptchaService;
+use App\Support\ApiResponse;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Hash;
+use Illuminate\Support\Str;
+
+/**
+ * POST /api/v1/admin/auth/login
+ *
+ * Body: account（登录账号，与 username 对应，ASCII 仅存小写比对）、password、captcha_key、captcha_code。
+ */
+final class LoginController
+{
+    public function __invoke(Request $request, AdminCaptchaService $captcha): JsonResponse
+    {
+        $locale = $request->lotteryLocale();
+
+        /** @var array{account:string,password:string,captcha_key:string,captcha_code:string} $data */
+        $data = validator($request->all(), [
+            'account' => ['required', 'string', 'min:2', 'max:64', 'regex:/^[a-zA-Z0-9._-]+$/u'],
+            'password' => ['required', 'string', 'max:256'],
+            'captcha_key' => ['required', 'string', 'uuid'],
+            'captcha_code' => ['required', 'string', 'max:32'],
+        ], [], [
+            'account' => 'account',
+            'password' => 'password',
+            'captcha_key' => 'captcha_key',
+            'captcha_code' => 'captcha_code',
+        ])->validate();
+
+        if (! $captcha->verify($data['captcha_key'], $data['captcha_code'])) {
+            return ApiResponse::error(
+                trans('admin.invalid_captcha', [], $locale),
+                ErrorCode::AdminCaptchaInvalid->value,
+                null,
+                422,
+            );
+        }
+
+        $normalizedAccount = Str::lower(trim($data['account']));
+
+        /** @var AdminUser|null $admin */
+        $admin = AdminUser::query()->where('username', $normalizedAccount)->first();
+
+        $passwordOk = $admin !== null && Hash::check($data['password'], $admin->password);
+
+        if (! $passwordOk) {
+            /** 统一措辞，弱化枚举用户 */
+            return ApiResponse::error(
+                trans('admin.invalid_credentials', [], $locale),
+                ErrorCode::AdminCredentialsInvalid->value,
+                null,
+                401,
+            );
+        }
+
+        if ((int) $admin->status !== 0) {
+            return ApiResponse::error(
+                trans('admin.account_disabled', [], $locale),
+                ErrorCode::AdminAccountDisabled->value,
+                null,
+                403,
+            );
+        }
+
+        $plainToken = $admin->createToken('admin-api')->plainTextToken;
+
+        $admin->forceFill(['last_login_at' => now()])->save();
+
+        return ApiResponse::success([
+            'token' => $plainToken,
+            'token_type' => 'Bearer',
+            'admin' => [
+                'id' => $admin->id,
+                'username' => $admin->username,
+                'nickname' => $admin->name,
+                'email' => $admin->email,
+            ],
+        ]);
+    }
+}

app/Http/Controllers/Api/V1/Admin/PingController.php

@@ -7,7 +7,7 @@ use App\Support\ApiResponse;
 use Illuminate\Http\JsonResponse;
 
 /**
- * 无需登录（当前 admin 中间件为直通）：确认 `/api/v1/admin` 前缀可达。
+ * Bearer Token 必填（{@see EnsureAdminApi} + Sanctum）；确认 `/api/v1/admin` 鉴权链路可达。
  * 路由：GET /api/v1/admin/ping
  */
 class PingController extends Controller