refactor(client): 授权信息卡从「关于我们」迁至 设置→授权管理，替换授权到期时间卡

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

client/lib/screens/about/about_screen.dart

@@ -6,7 +6,6 @@
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:intl/intl.dart';
 import 'package:lucide_icons_flutter/lucide_icons.dart';
 import 'package:url_launcher/url_launcher.dart';
 
@@ -16,11 +15,9 @@ import '../../core/responsive/responsive.dart';
 import '../../core/theme/app_dims.g.dart';
 import '../../core/theme/context_tokens.dart';
 import '../../core/update/app_updater.dart';
-import '../../core/utils/clock.dart';
 import '../../core/utils/dialog_util.dart';
 import '../../providers/changelog_provider.dart';
 import '../../providers/feedback_provider.dart';
-import '../../providers/license_provider.dart';
 import '../../providers/update_provider.dart';
 import '../../core/theme/app_fonts.dart';
 import '../../widgets/brand_mark.dart';
@@ -55,7 +52,6 @@ class _AboutScreenState extends ConsumerState<AboutScreen> {
               children: [
                 _heroCard(t),
                 _productCard(t),
-                _licenseCard(t),
                 _changelogCard(t),
                 // 页脚
                 Padding(
@@ -372,72 +368,8 @@ class _AboutScreenState extends ConsumerState<AboutScreen> {
     }
   }
 
-  // ── 卡3：授权信息（3 cell）─────────────────────────────────
-  Widget _licenseCard(dynamic t) {
-    final lic = ref.watch(licenseProvider).valueOrNull;
-    final expires = lic?.expiresAt != null
-        ? DateFormat('yyyy-MM-dd').format(lic!.expiresAt!)
-        : '—';
-    // 状态/剩余天数走可注入时钟（golden 确定化）
-    final active = lic?.isActive == true &&
-        (lic?.expiresAt == null || lic!.expiresAt!.isAfter(appNow()));
-    final days = lic?.expiresAt != null
-        ? lic!.expiresAt!.difference(appNow()).inDays.clamp(0, 99999)
-        : null;
-    final mobile = context.isMobile;
-    final cells = [
-      _licCell(t, '授权状态', active ? '已授权' : '未授权',
-          color: active ? t.success : t.warn),
-      _licCell(t, '到期日', expires),
-      _licCell(t, '剩余天数', days != null ? '$days 天' : '—'),
-    ];
-    return _card(
-      t,
-      Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
-        _cardH(t, LucideIcons.shieldCheck, '授权信息'),
-        if (mobile)
-          Column(children: [
-            for (final c in cells)
-              Padding(padding: const EdgeInsets.only(bottom: 10), child: c),
-          ])
-        else
-          Row(children: [
-            for (var i = 0; i < cells.length; i++) ...[
-              if (i > 0) const SizedBox(width: 14),
-              Expanded(child: cells[i]),
-            ],
-          ]),
-      ]),
-    );
-  }
-
-  /// 原型 .lic-cell：lk 11 muted + lv 17/700/mono。
-  Widget _licCell(dynamic t, String label, String value, {Color? color}) =>
-      Container(
-        padding: const EdgeInsets.fromLTRB(16, 14, 16, 14),
-        decoration: BoxDecoration(
-          color: t.bg,
-          border: Border.all(color: t.borderSubtle),
-          borderRadius: BorderRadius.circular(AppDims.rMd),
-        ),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text(label,
-                style: TextStyle(fontSize: AppDims.fsXs, color: t.muted)),
-            const SizedBox(height: 6),
-            Text(value,
-                style: TextStyle(
-                    fontSize: AppDims.fsH2,
-                    fontWeight: FontWeight.w700,
-                    fontFamily: AppFonts.mono,
-                    fontFamilyFallback: AppFonts.monoFallback,
-                    color: color ?? t.heading)),
-          ],
-        ),
-      );
-
-  // ── 卡4：更新日志（timeline，默认 2 条 + 展开）───────────────
+  // ── 卡3：更新日志（timeline，默认 2 条 + 展开）───────────────
+  // （原授权信息卡已迁至 设置 → 授权管理）
   Widget _changelogCard(dynamic t) {
     final appVersion = ref.watch(appVersionProvider).valueOrNull ?? '';
     final entries = ref.watch(changelogProvider).valueOrNull ?? const [];