feat(devices): 设备默认名「平台简写·主机名」+ 支持重命名(1.0.13)

① 默认名:DeviceIdentity 改「平台简写(Win/Mac/Linux/iOS/Andr)·主机名」,主机名截
   到 8、总长≈12(替代裸主机名,更短)。
② 重命名:新端点 POST /v1/me/devices/{uuid}/rename(Service.RenameDevice 校验归属+
   截 64);store.UpdateName;客户端 account_api.renameDevice + provider.rename +
   「我的设备」⋯ 菜单加「重命名」+ 输入弹窗;l10n(zh/en)。
③ 版本 1.0.13。
测试:server RenameDevice(归属/空名/404)+ 客户端 rename widget;全量 go/flutter 绿。

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

client/lib/widgets/account_screens.dart

@@ -219,6 +219,10 @@ class DevicesScreen extends ConsumerWidget {
         color: c.surface,
         shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(PangolinRadius.md), side: BorderSide(color: c.border)),
         itemBuilder: (_) => [
+          PopupMenuItem(value: 'rename', child: Row(children: [
+            Icon(PangolinIcons.edit, size: 16, color: c.fg2), const SizedBox(width: 10),
+            Text(t.devRename, style: PangolinText.sm.copyWith(color: c.fg1)),
+          ])),
           PopupMenuItem(value: 'logout', child: Row(children: [
             Icon(PangolinIcons.logOut, size: 16, color: c.fg2), const SizedBox(width: 10),
             Text(t.devForceLogout, style: PangolinText.sm.copyWith(color: c.fg1)),
@@ -229,6 +233,13 @@ class DevicesScreen extends ConsumerWidget {
           ])),
         ],
         onSelected: (v) async {
+          if (v == 'rename') {
+            final newName = await _renameDialog(context, c, d);
+            if (newName != null && newName.trim().isNotEmpty) {
+              await ref.read(devicesProvider.notifier).rename(d.uuid, newName.trim());
+            }
+            return;
+          }
           final isClear = v == 'clear';
           final label = isClear ? t.devClearLogin : t.devForceLogout;
           final shown = d.name.isNotEmpty ? d.name : d.platformKind.label;
@@ -271,6 +282,37 @@ class DevicesScreen extends ConsumerWidget {
     );
     return ok ?? false;
   }
+
+  // 重命名弹窗:预填当前名,返回新名(取消返回 null)。
+  Future<String?> _renameDialog(BuildContext context, PangolinScheme c, Device d) {
+    final ctl = TextEditingController(text: d.name);
+    return showDialog<String>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        backgroundColor: c.surface,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(PangolinRadius.xl)),
+        title: Text(t.devRename, style: PangolinText.body.copyWith(color: c.fg1, fontWeight: FontWeight.w700)),
+        content: TextField(
+          controller: ctl,
+          autofocus: true,
+          maxLength: 64,
+          style: PangolinText.sm.copyWith(color: c.fg1),
+          decoration: InputDecoration(
+            hintText: t.devRenameHint,
+            counterText: '',
+            hintStyle: PangolinText.sm.copyWith(color: c.fg3),
+          ),
+          onSubmitted: (v) => Navigator.pop(ctx, v),
+        ),
+        actions: [
+          TextButton(onPressed: () => Navigator.pop(ctx),
+              child: Text(t.devCancel, style: PangolinText.sm.copyWith(color: c.fg2, fontWeight: FontWeight.w600))),
+          TextButton(onPressed: () => Navigator.pop(ctx, ctl.text),
+              child: Text(t.devSave, style: PangolinText.sm.copyWith(color: c.accent, fontWeight: FontWeight.w700))),
+        ],
+      ),
+    );
+  }
 }
 
 /// ── 兑换 & 购买 ── (兑换码走 POST /v1/redeem,成功后刷新账户)

client/lib/widgets/pangolin_icons.dart

@@ -58,6 +58,7 @@ class PangolinIcons {
   static const moreVertical = LucideIcons.moreVertical;
   static const trash        = LucideIcons.trash2;
   static const alertTriangle= LucideIcons.alertTriangle;
+  static const edit         = LucideIcons.pencil;
 
   static IconData? byName(String name) => _byName[name];