feat: 사용자 작업(감사) 로그 자동 기록 + 관리자 조회 화면

- Auditable 트레잇: 모델 insert/update/delete 시 activity_log 자동 기록
  (조회 제외, before/after JSON, 민감필드 마스킹, 사용자/IP)
- 도메인 모델 28개에 적용 (로그성 테이블 제외)
- 관리자 전용 조회: Admin\ActivityLog (기간/작업/대상/사용자 필터 + 상세 변경내역)
- 라우트 admin/access/activity-logs(+상세), 메뉴 '활동 로그' 추가
- 테넌트 분리: 슈퍼=전체, 지자체관리자=소속 지자체만

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Views/admin/access/activity_log_detail.php

@@ -0,0 +1,69 @@
+<?php
+declare(strict_types=1);
+/**
+ * @var object $row
+ * @var array<string,mixed> $before
+ * @var array<string,mixed> $after
+ * @var array<string,string> $tableLabels
+ * @var array<string,string> $actionLabels
+ */
+$act = (string) ($row->al_action ?? '');
+$tbl = (string) ($row->al_table ?? '');
+$who = trim((string) ($row->mb_name ?? '') . (($row->mb_id ?? '') !== '' ? ' (' . $row->mb_id . ')' : ''));
+
+// 변경된 키 강조용: before/after 값이 다른 키
+$allKeys = array_values(array_unique(array_merge(array_keys($before), array_keys($after))));
+$fmt = static function ($v): string {
+    if (is_array($v)) {
+        return json_encode($v, JSON_UNESCAPED_UNICODE);
+    }
+    return (string) ($v ?? '');
+};
+?>
+<section class="p-4">
+  <div class="flex items-center justify-between mb-3 no-print">
+    <a href="<?= base_url('admin/access/activity-logs') ?>" class="text-sm text-blue-700 hover:underline">&larr; 목록으로</a>
+    <button onclick="window.print()" class="border border-btn-print-border text-gray-600 px-3 py-1 rounded-sm text-sm hover:bg-gray-50">인쇄</button>
+  </div>
+
+  <table class="w-full data-table text-sm mb-5" style="max-width:680px;">
+    <tbody>
+      <tr><th class="text-left bg-gray-50 w-32">일시</th><td class="text-left pl-2"><?= esc((string) ($row->al_regdate ?? '')) ?></td></tr>
+      <tr><th class="text-left bg-gray-50">사용자</th><td class="text-left pl-2"><?= $who !== '' ? esc($who) : '시스템' ?></td></tr>
+      <tr><th class="text-left bg-gray-50">작업</th><td class="text-left pl-2"><?= esc($actionLabels[$act] ?? $act) ?></td></tr>
+      <tr><th class="text-left bg-gray-50">대상</th><td class="text-left pl-2"><?= esc($tableLabels[$tbl] ?? $tbl) ?> (<?= esc($tbl) ?>) · 번호 <?= (int) ($row->al_record_id ?? 0) ?></td></tr>
+      <tr><th class="text-left bg-gray-50">IP</th><td class="text-left pl-2"><?= esc((string) ($row->al_ip ?? '')) ?></td></tr>
+    </tbody>
+  </table>
+
+  <h3 class="font-bold text-gray-700 mb-2">변경 내역 (전 → 후)</h3>
+  <?php if ($allKeys === []): ?>
+    <p class="text-gray-400 text-sm">상세 데이터가 없습니다.</p>
+  <?php else: ?>
+  <div class="border border-gray-300 rounded-lg overflow-auto">
+    <table class="w-full data-table text-sm">
+      <thead>
+        <tr>
+          <th class="text-left w-40">항목</th>
+          <th class="text-left">변경 전</th>
+          <th class="text-left">변경 후</th>
+        </tr>
+      </thead>
+      <tbody>
+        <?php foreach ($allKeys as $k): ?>
+          <?php
+            $b = array_key_exists($k, $before) ? $fmt($before[$k]) : null;
+            $a = array_key_exists($k, $after) ? $fmt($after[$k]) : null;
+            $changed = ($act === 'update') && ($b !== $a);
+          ?>
+          <tr<?= $changed ? ' style="background:#fffbeb;"' : '' ?>>
+            <td class="text-left pl-2 font-semibold text-gray-700"><?= esc((string) $k) ?></td>
+            <td class="text-left pl-2 <?= $changed ? 'text-red-700' : 'text-gray-500' ?>"><?= $b === null ? '<span class="text-gray-300">—</span>' : esc($b) ?></td>
+            <td class="text-left pl-2 <?= $changed ? 'text-blue-700 font-semibold' : 'text-gray-700' ?>"><?= $a === null ? '<span class="text-gray-300">—</span>' : esc($a) ?></td>
+          </tr>
+        <?php endforeach; ?>
+      </tbody>
+    </table>
+  </div>
+  <?php endif; ?>
+</section>