feat: [hr] 입퇴사자 현황 페이지 구현

- EmployeeService에 근속기간 조회/통계/CSV 내보내기 메서드 추가
- API 컨트롤러에 tenure/tenureExport 엔드포인트 추가
- EmployeeTenureController 뷰 컨트롤러 생성
- 통계 카드 6개 (전체/재직/퇴직/평균근속/올해입사/올해퇴사)
- HTMX 테이블 (사원/부서/직책/상태/입사일/퇴사일/근속기간/근속일수)
- 필터: 이름검색, 부서, 상태, 입사기간 범위, 정렬
- CSV 엑셀 다운로드 기능

app/Http/Controllers/Api/Admin/HR/EmployeeController.php

@@ -6,11 +6,13 @@
 use App\Models\Boards\File;
 use App\Services\GoogleCloudStorageService;
 use App\Services\HR\EmployeeService;
+use Carbon\Carbon;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Http\Response;
 use Illuminate\Support\Facades\Storage;
 use Illuminate\Support\Str;
+use Symfony\Component\HttpFoundation\StreamedResponse;
 
 class EmployeeController extends Controller
 {
@@ -383,6 +385,119 @@ public function downloadFile(int $id, int $fileId, GoogleCloudStorageService $gc
         abort(404, '파일이 서버에 존재하지 않습니다.');
     }
 
+    /**
+     * 입퇴사자 현황 목록 (HTMX → HTML / 일반 → JSON)
+     */
+    public function tenure(Request $request): JsonResponse|Response
+    {
+        $employees = $this->employeeService->getEmployeeTenure(
+            $request->all(),
+            $request->integer('per_page', 50)
+        );
+
+        // 근속기간 계산 추가
+        $employees->getCollection()->each(function ($employee) {
+            $hireDate = $employee->hire_date;
+            if ($hireDate) {
+                $hire = Carbon::parse($hireDate);
+                $end = $employee->resign_date ? Carbon::parse($employee->resign_date) : today();
+                $tenureDays = $hire->diffInDays($end);
+                $diff = $hire->diff($end);
+
+                $employee->tenure_days = $tenureDays;
+                $employee->tenure_label = $this->formatTenureLabel($diff);
+            } else {
+                $employee->tenure_days = 0;
+                $employee->tenure_label = '-';
+            }
+        });
+
+        if ($request->header('HX-Request')) {
+            $stats = $this->employeeService->getTenureStats();
+
+            return response(view('hr.employee-tenure.partials.table', compact('employees', 'stats')));
+        }
+
+        return response()->json([
+            'success' => true,
+            'data' => $employees->items(),
+            'meta' => [
+                'current_page' => $employees->currentPage(),
+                'last_page' => $employees->lastPage(),
+                'per_page' => $employees->perPage(),
+                'total' => $employees->total(),
+            ],
+        ]);
+    }
+
+    /**
+     * 입퇴사자 현황 CSV 내보내기
+     */
+    public function tenureExport(Request $request): StreamedResponse
+    {
+        $employees = $this->employeeService->getTenureExportData($request->all());
+
+        $filename = '입퇴사자현황_'.now()->format('Ymd').'.csv';
+
+        return response()->streamDownload(function () use ($employees) {
+            $handle = fopen('php://output', 'w');
+
+            // BOM for Excel UTF-8
+            fwrite($handle, "\xEF\xBB\xBF");
+
+            // 헤더
+            fputcsv($handle, ['No.', '사원명', '부서', '직책', '상태', '입사일', '퇴사일', '근속기간', '근속일수']);
+
+            $index = 1;
+            foreach ($employees as $employee) {
+                $hireDate = $employee->hire_date;
+                $tenureDays = 0;
+                $tenureLabel = '-';
+
+                if ($hireDate) {
+                    $hire = Carbon::parse($hireDate);
+                    $end = $employee->resign_date ? Carbon::parse($employee->resign_date) : today();
+                    $tenureDays = $hire->diffInDays($end);
+                    $tenureLabel = $this->formatTenureLabel($hire->diff($end));
+                }
+
+                $statusMap = ['active' => '재직', 'leave' => '휴직', 'resigned' => '퇴직'];
+
+                fputcsv($handle, [
+                    $index++,
+                    $employee->display_name ?? $employee->user?->name ?? '-',
+                    $employee->department?->name ?? '-',
+                    $employee->position_label ?? '-',
+                    $statusMap[$employee->employee_status] ?? $employee->employee_status,
+                    $employee->hire_date ?? '-',
+                    $employee->resign_date ?? '-',
+                    $tenureLabel,
+                    $tenureDays,
+                ]);
+            }
+
+            fclose($handle);
+        }, $filename, [
+            'Content-Type' => 'text/csv; charset=UTF-8',
+        ]);
+    }
+
+    private function formatTenureLabel(\DateInterval $diff): string
+    {
+        $parts = [];
+        if ($diff->y > 0) {
+            $parts[] = "{$diff->y}년";
+        }
+        if ($diff->m > 0) {
+            $parts[] = "{$diff->m}개월";
+        }
+        if ($diff->d > 0 || empty($parts)) {
+            $parts[] = "{$diff->d}일";
+        }
+
+        return implode(' ', $parts);
+    }
+
     /**
      * 직급/직책 추가
      */