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.

sdk/cliproxy/usage/manager.go

@@ -22,9 +22,16 @@ type Record struct {
 	RequestedAt time.Time
 	Latency     time.Duration
 	Failed      bool
+	Fail        Failure
 	Detail      Detail
 }
 
+// Failure holds HTTP failure metadata for an upstream request attempt.
+type Failure struct {
+	StatusCode int
+	Body       string
+}
+
 // Detail holds the token usage breakdown.
 type Detail struct {
 	InputTokens     int64