fix: GatewayClient Tool-Namen + Response-Unwrapping

- sub_agents_list → subagents (action: list)
- cron_list → cron (action: list)
- Ping / → /health
- Unwrap {ok, result} envelope in InvokeToolAsync

backend/Services/OpenClawGatewayClient.cs

@@ -50,7 +50,11 @@ public sealed class OpenClawGatewayClient(HttpClient httpClient, IConfiguration
             if (string.IsNullOrWhiteSpace(json))
                 return null;
 
-            return JsonNode.Parse(json);
+            var node = JsonNode.Parse(json);
+            // Unwrap the { ok: true, result: ... } envelope
+            if (node?["ok"]?.GetValue<bool>() == true && node["result"] is not null)
+                return node["result"];
+            return node;
         }
         catch
         {
@@ -91,7 +95,7 @@ public sealed class OpenClawGatewayClient(HttpClient httpClient, IConfiguration
         }
 
         // Also get subagents list
-        var subagentsResult = await InvokeToolAsync("sub_agents_list");
+        var subagentsResult = await InvokeToolAsync("subagents", new { action = "list" });
         if (subagentsResult is not null && subagentsResult is JsonArray subArray)
         {
             foreach (var sub in subArray)
@@ -190,7 +194,7 @@ public sealed class OpenClawGatewayClient(HttpClient httpClient, IConfiguration
     {
         try
         {
-            var result = await InvokeToolAsync("cron_list");
+            var result = await InvokeToolAsync("cron", new { action = "list" });
             if (result is null)
                 return new List<QueueItem>();
 
@@ -226,7 +230,7 @@ public sealed class OpenClawGatewayClient(HttpClient httpClient, IConfiguration
         try
         {
             // Check gateway health
-            using var pingRequest = new HttpRequestMessage(HttpMethod.Get, "/");
+            using var pingRequest = new HttpRequestMessage(HttpMethod.Get, "/health");
             ApplyAuth(pingRequest);
             using var pingResponse = await httpClient.SendAsync(pingRequest);
             gatewayOk = pingResponse.IsSuccessStatusCode;