feat: daily node restart controlled from the admin, connect timings as a default line task [CI]

Agents and Probes exit in order at a configured time (default 04:30 UTC+8, switch and time zone in the admin settings) and the service manager starts them again; a local restart_at or MOSHIRO_RESTART_AT wins. The connect kind (TCP connect and TLS handshake timings) is now a default continuous line template, with a section on the line page.

backend/src/MoShiro.Backend.Api/Admin/SystemEndpoints.cs

@@ -63,9 +63,14 @@ public static class SystemEndpoints
     private static async Task<IResult> ListSettingsAsync(SettingsService settings, CancellationToken ct) =>
         TypedResults.Json(new PageDto<SettingDto>([.. (await settings.ListAsync(ct)).Select(Mappers.ToDto)], null), ApiJsonContext.Default.PageDtoSettingDto);
 
-    private static async Task<IResult> PatchSettingsAsync(HttpContext http, SettingsService settings, AgentService agents, Dictionary<string, JsonElement> changes)
+    private static async Task<IResult> PatchSettingsAsync(HttpContext http, SettingsService settings, AgentService agents, ScheduleService schedule, Dictionary<string, JsonElement> changes)
     {
         Result<IReadOnlyList<SettingView>> result = await settings.PatchAsync(changes, http.RequestAborted);
+        if (result.IsSuccess && changes.Keys.Any(k => k.StartsWith("fleet.restart_", StringComparison.Ordinal)))
+        {
+            await schedule.SendToAllAsync(http.RequestAborted); // 定时重启设置变了：马上通知所有在线节点
+        }
+
         if (result.IsSuccess && changes.ContainsKey(SettingsService.AutoLink))
         {
             await agents.AfterAgentSetChangedAsync(http.RequestAborted); // 自动连接开关变了：重新下发各 Probe 的 Agent 列表和各 Agent 允许的 Probe