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.go

@@ -66,6 +66,7 @@ func (p *usageQueuePlugin) HandleUsage(ctx context.Context, record coreusage.Rec
 	if !failed {
 		failed = !resolveSuccess(ctx)
 	}
+	fail := resolveFail(ctx, record, failed)
 
 	detail := requestDetail{
 		Timestamp: timestamp,
@@ -74,6 +75,7 @@ func (p *usageQueuePlugin) HandleUsage(ctx context.Context, record coreusage.Rec
 		AuthIndex: record.AuthIndex,
 		Tokens:    tokens,
 		Failed:    failed,
+		Fail:      fail,
 	}
 
 	payload, err := json.Marshal(queuedUsageDetail{
@@ -110,6 +112,7 @@ type requestDetail struct {
 	AuthIndex string     `json:"auth_index"`
 	Tokens    tokenStats `json:"tokens"`
 	Failed    bool       `json:"failed"`
+	Fail      failDetail `json:"fail"`
 }
 
 type tokenStats struct {
@@ -120,6 +123,28 @@ type tokenStats struct {
 	TotalTokens     int64 `json:"total_tokens"`
 }
 
+type failDetail struct {
+	StatusCode int    `json:"status_code"`
+	Body       string `json:"body"`
+}
+
+func resolveFail(ctx context.Context, record coreusage.Record, failed bool) failDetail {
+	fail := failDetail{
+		StatusCode: record.Fail.StatusCode,
+		Body:       strings.TrimSpace(record.Fail.Body),
+	}
+	if !failed {
+		return failDetail{StatusCode: 200}
+	}
+	if fail.StatusCode <= 0 {
+		fail.StatusCode = internallogging.GetResponseStatus(ctx)
+	}
+	if fail.StatusCode <= 0 {
+		fail.StatusCode = 500
+	}
+	return fail
+}
+
 func resolveSuccess(ctx context.Context) bool {
 	status := internallogging.GetResponseStatus(ctx)
 	if status == 0 {