feat: LicenseGuard 中间件 + Flutter license model/repo (21D+21E)
21D — 后端: - Claims 新增 LicenseExpiresAt (*int64 unix 秒),写入 JWT 避免每次查库 - middleware/license_guard.go: CalcLicensePhase / LicenseGuard / GetLicensePhase - grace(0-7d): 允许通行 - readonly(7-15d): 拦截非 GET 写操作 → 403 - locked(15d+): 全部拦截 → 403 - auth.go: issueTokens 在 JWT 中嵌入 license expires_at;Login 检查 locked 拒绝登录 - router: license/* 路由豁免 LicenseGuard(锁定时仍可激活/查状态) 21E — Flutter 前端: - models/license.dart: 新 LicenseInfo,含 phase/maxDevices,去掉旧 activatedAt - core/device/device_id.dart: 持久化 UUID-v4 作为设备 ID(SharedPreferences) - repositories/license_repository.dart: getInfo/activate/deactivate,激活时携带设备信息 - providers/license_provider.dart: 改接 LicenseRepository - settings_screen.dart: activatedAt 改为显示 maxDevices Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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@@ -381,10 +381,7 @@ class _SettingsScreenState extends ConsumerState<SettingsScreen> {
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value: DateFormat('yyyy-MM-dd').format(lic.expiresAt!))
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else
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const _ParamRow(label: '到期时间', value: '永久有效'),
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if (lic.activatedAt != null)
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_ParamRow(
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label: '激活时间',
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value: DateFormat('yyyy-MM-dd').format(lic.activatedAt!)),
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_ParamRow(label: '设备上限', value: '${lic.maxDevices} 台'),
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const SizedBox(height: 12),
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OutlinedButton.icon(
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onPressed: _showRenewLicenseDialog,
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