fix: gitignore 排除了 PNG 资源导致构建失败

- .gitignore 中 *.png 规则误忽略了 web/src/assets/ 和 web/public/ 下的 logo/favicon
- 添加例外规则允许 web 资源目录的 PNG 文件
- 补提交 logo_32/128/512.png + favicon.png
- 审计日志变更详情优化：字段名中文化 + 布尔值显示优化 + 空值兜底

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -31,6 +31,9 @@ test-screenshots/
 
 # === Screenshots & prototype images ===
 *.png
+# Allow web assets and public PNGs
+!web/src/assets/*.png
+!web/public/*.png
 
 # === Environment ===
 .env

web/src/pages/AuditLogsPage.tsx

@@ -22,48 +22,62 @@ const ACTION_OPTIONS = [
   { label: '切换成员状态', value: 'member_status_toggle' },
 ];
 
+const FIELD_LABELS: Record<string, string> = {
+  default_daily_seconds_limit: '每日限额',
+  default_monthly_seconds_limit: '每月限额',
+  announcement: '公告内容',
+  announcement_enabled: '公告开关',
+  name: '名称',
+  monthly_seconds_limit: '月额度',
+  total_seconds_pool: '秒数池',
+  is_active: '状态',
+  daily_seconds_limit: '每日限额',
+  username: '用户名',
+  email: '邮箱',
+  role: '角色',
+};
+
+function formatVal(val: unknown): string {
+  if (val === true) return '开启';
+  if (val === false) return '关闭';
+  if (val === '' || val === null || val === undefined) return '(空)';
+  return String(val);
+}
+
 function renderChanges(before: Record<string, unknown> | null, after: Record<string, unknown> | null) {
   if (!before && !after) return '-';
   const fields = new Set([...Object.keys(before || {}), ...Object.keys(after || {})]);
   if (fields.size === 0) return '-';
 
-  return (
-    <div className={styles.changeDetail}>
-      {[...fields].map((field) => {
-        const oldVal = before?.[field];
-        const newVal = after?.[field];
-        if (oldVal === undefined && newVal !== undefined) {
-          return (
-            <div key={field} className={styles.changeItem}>
-              <span className={styles.changeField}>{field}:</span>
-              <span className={styles.changeNew}>{String(newVal)}</span>
-            </div>
-          );
-        }
-        if (oldVal !== undefined && newVal !== undefined && String(oldVal) !== String(newVal)) {
-          return (
-            <div key={field} className={styles.changeItem}>
-              <span className={styles.changeField}>{field}:</span>
-              <span className={styles.changeOld}>{String(oldVal)}</span>
-              <span className={styles.changeArrow}>&rarr;</span>
-              <span className={styles.changeNew}>{String(newVal)}</span>
-            </div>
-          );
-        }
-        if (oldVal === undefined && newVal === undefined) return null;
-        // Same value, show as-is for create actions
-        if (oldVal === undefined) {
-          return (
-            <div key={field} className={styles.changeItem}>
-              <span className={styles.changeField}>{field}:</span>
-              <span className={styles.changeNew}>{String(newVal)}</span>
-            </div>
-          );
-        }
-        return null;
-      })}
-    </div>
-  );
+  const items: JSX.Element[] = [];
+
+  for (const field of fields) {
+    const oldVal = before?.[field];
+    const newVal = after?.[field];
+    const label = FIELD_LABELS[field] || field;
+
+    if (oldVal === undefined && newVal !== undefined) {
+      items.push(
+        <div key={field} className={styles.changeItem}>
+          <span className={styles.changeField}>{label}:</span>
+          <span className={styles.changeNew}>{formatVal(newVal)}</span>
+        </div>
+      );
+    } else if (oldVal !== undefined && newVal !== undefined && formatVal(oldVal) !== formatVal(newVal)) {
+      items.push(
+        <div key={field} className={styles.changeItem}>
+          <span className={styles.changeField}>{label}:</span>
+          <span className={styles.changeOld}>{formatVal(oldVal)}</span>
+          <span className={styles.changeArrow}>&rarr;</span>
+          <span className={styles.changeNew}>{formatVal(newVal)}</span>
+        </div>
+      );
+    }
+  }
+
+  return items.length > 0
+    ? <div className={styles.changeDetail}>{items}</div>
+    : <span style={{ color: '#8b8ea8' }}>无变更</span>;
 }
 
 export function AuditLogsPage() {