feat(home): implement count for home auth dispatch requests and enable usage statistics

- Added `count` attribute to `homeAuthCount` requests to improve home message batching.
- Enabled usage statistics for home mode by default and added config-level enforcement.
- Adjusted failure logging to include detailed metadata in `UsageReporter`.
- Updated multiple executors to pass error details to `PublishFailure` for better debugging.
- Enhanced unit tests to validate `count` behavior and usage statistics enforcement across components.

internal/redisqueue/plugin_test.go

@@ -44,9 +44,10 @@ func TestUsageQueuePluginPayloadIncludesStableFieldsAndSuccess(t *testing.T) {
 		requireStringField(t, payload, "alias", "client-gpt")
 		requireStringField(t, payload, "endpoint", "POST /v1/chat/completions")
 		requireStringField(t, payload, "auth_type", "apikey")
-		requireStringField(t, payload, "user_api_key", "test-key")
+		requireMissingField(t, payload, "user_api_key")
 		requireStringField(t, payload, "request_id", "ctx-request-id")
 		requireBoolField(t, payload, "failed", false)
+		requireFailField(t, payload, http.StatusOK, "")
 	})
 }
 
@@ -68,6 +69,10 @@ func TestUsageQueuePluginPayloadIncludesStableFieldsAndFailureAndGinRequestID(t
 			Source:      "user@example.com",
 			RequestedAt: time.Date(2026, 4, 25, 0, 0, 0, 0, time.UTC),
 			Latency:     2500 * time.Millisecond,
+			Fail: coreusage.Failure{
+				StatusCode: http.StatusInternalServerError,
+				Body:       "upstream failed",
+			},
 			Detail: coreusage.Detail{
 				InputTokens:  10,
 				OutputTokens: 20,
@@ -81,9 +86,10 @@ func TestUsageQueuePluginPayloadIncludesStableFieldsAndFailureAndGinRequestID(t
 		requireStringField(t, payload, "alias", "client-mini")
 		requireStringField(t, payload, "endpoint", "GET /v1/responses")
 		requireStringField(t, payload, "auth_type", "apikey")
-		requireStringField(t, payload, "user_api_key", "test-key")
+		requireMissingField(t, payload, "user_api_key")
 		requireStringField(t, payload, "request_id", "gin-request-id")
 		requireBoolField(t, payload, "failed", true)
+		requireFailField(t, payload, http.StatusInternalServerError, "upstream failed")
 	})
 }
 
@@ -115,6 +121,10 @@ func TestUsageQueuePluginAsyncIgnoresRecycledGinContext(t *testing.T) {
 			Source:      "user@example.com",
 			RequestedAt: time.Date(2026, 4, 25, 0, 0, 0, 0, time.UTC),
 			Latency:     1500 * time.Millisecond,
+			Fail: coreusage.Failure{
+				StatusCode: http.StatusBadGateway,
+				Body:       "bad gateway",
+			},
 			Detail: coreusage.Detail{
 				InputTokens:  10,
 				OutputTokens: 20,
@@ -125,9 +135,10 @@ func TestUsageQueuePluginAsyncIgnoresRecycledGinContext(t *testing.T) {
 		payload := waitForSinglePayload(t, 2*time.Second)
 		requireStringField(t, payload, "endpoint", "POST /v1/chat/completions")
 		requireStringField(t, payload, "alias", "client-gpt")
-		requireStringField(t, payload, "user_api_key", "test-key")
+		requireMissingField(t, payload, "user_api_key")
 		requireStringField(t, payload, "request_id", "ctx-request-id")
 		requireBoolField(t, payload, "failed", true)
+		requireFailField(t, payload, http.StatusBadGateway, "bad gateway")
 	})
 }
 
@@ -217,6 +228,14 @@ func requireStringField(t *testing.T, payload map[string]json.RawMessage, key, w
 	}
 }
 
+func requireMissingField(t *testing.T, payload map[string]json.RawMessage, key string) {
+	t.Helper()
+
+	if _, ok := payload[key]; ok {
+		t.Fatalf("payload unexpectedly contains %q", key)
+	}
+}
+
 type pluginFunc func(context.Context, coreusage.Record)
 
 func (fn pluginFunc) HandleUsage(ctx context.Context, record coreusage.Record) {
@@ -238,3 +257,22 @@ func requireBoolField(t *testing.T, payload map[string]json.RawMessage, key stri
 		t.Fatalf("%s = %t, want %t", key, got, want)
 	}
 }
+
+func requireFailField(t *testing.T, payload map[string]json.RawMessage, wantStatus int, wantBody string) {
+	t.Helper()
+
+	raw, ok := payload["fail"]
+	if !ok {
+		t.Fatalf("payload missing %q", "fail")
+	}
+	var got struct {
+		StatusCode int    `json:"status_code"`
+		Body       string `json:"body"`
+	}
+	if err := json.Unmarshal(raw, &got); err != nil {
+		t.Fatalf("unmarshal fail: %v", err)
+	}
+	if got.StatusCode != wantStatus || got.Body != wantBody {
+		t.Fatalf("fail = {status_code:%d body:%q}, want {status_code:%d body:%q}", got.StatusCode, got.Body, wantStatus, wantBody)
+	}
+}