**refactor(middleware): extract request logging logic and optimize condition checks**

- Added `shouldLogRequest` helper to simplify path-based request logging logic.
- Updated middleware to skip management endpoints for improved security.
- Introduced an explicit `nil` logger check for minimal overhead.
- Updated dependencies in `go.mod`.

**feat(auth): add handling for 404 response with retry logic**

- Introduced support for 404 `not_found` status with a 12-hour backoff period.
- Updated `manager.go` to align state and status messages for 404 scenarios.

**refactor(translator): comment out debug logging in Gemini responses request**

sdk/cliproxy/auth/manager.go

@@ -564,6 +564,11 @@ func (m *Manager) MarkResult(ctx context.Context, result Result) {
 					state.NextRetryAfter = next
 					suspendReason = "payment_required"
 					shouldSuspendModel = true
+				case 404:
+					next := now.Add(12 * time.Hour)
+					state.NextRetryAfter = next
+					suspendReason = "not_found"
+					shouldSuspendModel = true
 				case 429:
 					var next time.Time
 					backoffLevel := state.Quota.BackoffLevel
@@ -804,6 +809,9 @@ func applyAuthFailureState(auth *Auth, resultErr *Error, retryAfter *time.Durati
 	case 402, 403:
 		auth.StatusMessage = "payment_required"
 		auth.NextRetryAfter = now.Add(30 * time.Minute)
+	case 404:
+		auth.StatusMessage = "not_found"
+		auth.NextRetryAfter = now.Add(12 * time.Hour)
 	case 429:
 		auth.StatusMessage = "quota exhausted"
 		auth.Quota.Exceeded = true