backend: serve single-agent task templates with their status and results, rename the kinds in storage

backend/src/MoShiro.Backend.Application/Tasks/EffectiveTasks.cs

@@ -13,7 +13,7 @@ public sealed record EffectiveTask(
     ParamValues Resolved);
 
 /// <summary>
-/// 有效任务集：线路任务模板 + 针对单个 Agent 的覆盖 + 该 Agent 的目标任务。
+/// 有效任务集：任务模板（线路任务、单个 Agent 的任务）+ 针对单个 Agent 的覆盖 + 只属于该 Agent 的目标任务。
 /// 参数经 ParamSpec 校验并补全默认值，Backend 和节点使用同一套规则。
 /// </summary>
 public static class EffectiveTasks
@@ -35,23 +35,23 @@ public static class EffectiveTasks
 
         foreach (TaskRecord task in all.OrderBy(t => t.Id.Value, StringComparer.Ordinal))
         {
-            if (task.Scope == LineScope && task.AgentId is null)
+            if (task.AgentId is null)
             {
-                // 模板：有覆盖时以覆盖为准（覆盖可以停用或改参数）
+                // 模板（线路任务或单个 Agent 的任务）：有覆盖时以覆盖为准（覆盖可以停用、改参数，单个 Agent 的任务还可以换目标）
                 TaskRecord? over = overrides.GetValueOrDefault(task.Id);
                 if (over is not null)
                 {
                     if (over.Enabled)
                     {
-                        Add(result, over.Id, task.Scope, over.Kind, null, Merge(task.Params, over.Params), over.Schedule, agent, filterByAgentKinds);
+                        Add(result, over.Id, task.Scope, over.Kind, over.Target ?? task.Target, Merge(task.Params, over.Params), over.Schedule, agent, filterByAgentKinds);
                     }
                 }
                 else if (task.Enabled)
                 {
-                    Add(result, task.Id, task.Scope, task.Kind, null, task.Params, task.Schedule, agent, filterByAgentKinds);
+                    Add(result, task.Id, task.Scope, task.Kind, task.Target, task.Params, task.Schedule, agent, filterByAgentKinds);
                 }
             }
-            else if (task.Scope == TargetScope && task.AgentId == agent.Id && task.Enabled)
+            else if (task.Scope == TargetScope && task.AgentId == agent.Id && task.BaseTaskId is null && task.Enabled)
             {
                 Add(result, task.Id, task.Scope, task.Kind, task.Target, task.Params, task.Schedule, agent, filterByAgentKinds);
             }