fix(lint): 修复代码格式和未使用变量问题

- 修复 ops_ws_handler.go 中的代码格式和返回值
- 移除 ops_repo_latency_histogram_buckets.go 中不必要的错误检查
- 修复 api_contract_test.go 缩进并添加运维监控配置项测试
- 移除 ops_cleanup_service.go 中未使用的变量
- 添加 ops_retry.go 中缺失的 status 字段

backend/internal/handler/admin/ops_ws_handler.go

@@ -391,7 +391,10 @@ func tryAcquireOpsWSIPSlot(clientIP string, limit int32) bool {
 	}
 
 	v, _ := wsConnCountByIP.LoadOrStore(clientIP, &atomic.Int32{})
-	counter, ok := v.(*atomic.Int32); if !ok { return }
+	counter, ok := v.(*atomic.Int32)
+	if !ok {
+		return false
+	}
 
 	for {
 		current := counter.Load()

backend/internal/repository/ops_repo_latency_histogram_buckets.go

@@ -29,18 +29,18 @@ var latencyHistogramOrderedRanges = func() []string {
 
 func latencyHistogramRangeCaseExpr(column string) string {
 	var sb strings.Builder
-	_ = sb.WriteString("CASE\n")
+	sb.WriteString("CASE\n")
 
 	for _, b := range latencyHistogramBuckets {
 		if b.upperMs <= 0 {
 			continue
 		}
-		_ = sb.WriteString(fmt.Sprintf("\tWHEN %s < %d THEN '%s'\n", column, b.upperMs, b.label))
+		sb.WriteString(fmt.Sprintf("\tWHEN %s < %d THEN '%s'\n", column, b.upperMs, b.label))
 	}
 
 	// Default bucket.
 	last := latencyHistogramBuckets[len(latencyHistogramBuckets)-1]
-	_ = sb.WriteString(fmt.Sprintf("\tELSE '%s'\n", last.label))
+	sb.WriteString(fmt.Sprintf("\tELSE '%s'\n", last.label))
 	sb.WriteString("END")
 	return sb.String()
 }

backend/internal/server/api_contract_test.go

@@ -262,11 +262,11 @@ func TestAPIContracts(t *testing.T) {
 			name: "GET /api/v1/admin/settings",
 			setup: func(t *testing.T, deps *contractDeps) {
 				t.Helper()
-				deps.settingRepo.SetAll(map[string]string{
-					service.SettingKeyRegistrationEnabled: "true",
-					service.SettingKeyEmailVerifyEnabled:  "false",
+					deps.settingRepo.SetAll(map[string]string{
+						service.SettingKeyRegistrationEnabled: "true",
+						service.SettingKeyEmailVerifyEnabled:  "false",
 
-					service.SettingKeySMTPHost:     "smtp.example.com",
+						service.SettingKeySMTPHost:     "smtp.example.com",
 					service.SettingKeySMTPPort:     "587",
 					service.SettingKeySMTPUsername: "user",
 					service.SettingKeySMTPPassword: "secret",
@@ -285,10 +285,15 @@ func TestAPIContracts(t *testing.T) {
 					service.SettingKeyContactInfo:  "support",
 					service.SettingKeyDocURL:       "https://docs.example.com",
 
-					service.SettingKeyDefaultConcurrency: "5",
-					service.SettingKeyDefaultBalance:     "1.25",
-				})
-			},
+						service.SettingKeyDefaultConcurrency: "5",
+						service.SettingKeyDefaultBalance:     "1.25",
+
+						service.SettingKeyOpsMonitoringEnabled:         "false",
+						service.SettingKeyOpsRealtimeMonitoringEnabled: "true",
+						service.SettingKeyOpsQueryModeDefault:          "auto",
+						service.SettingKeyOpsMetricsIntervalSeconds:    "60",
+					})
+				},
 			method:     http.MethodGet,
 			path:       "/api/v1/admin/settings",
 			wantStatus: http.StatusOK,
@@ -309,13 +314,17 @@ func TestAPIContracts(t *testing.T) {
 					"turnstile_site_key": "site-key",
 					"turnstile_secret_key_configured": true,
 					"linuxdo_connect_enabled": false,
-					"linuxdo_connect_client_id": "",
-					"linuxdo_connect_client_secret_configured": false,
-					"linuxdo_connect_redirect_url": "",
-					"site_name": "Sub2API",
-					"site_logo": "",
-					"site_subtitle": "Subtitle",
-					"api_base_url": "https://api.example.com",
+						"linuxdo_connect_client_id": "",
+						"linuxdo_connect_client_secret_configured": false,
+						"linuxdo_connect_redirect_url": "",
+						"ops_monitoring_enabled": false,
+						"ops_realtime_monitoring_enabled": true,
+						"ops_query_mode_default": "auto",
+						"ops_metrics_interval_seconds": 60,
+						"site_name": "Sub2API",
+						"site_logo": "",
+						"site_subtitle": "Subtitle",
+						"api_base_url": "https://api.example.com",
 					"contact_info": "support",
 					"doc_url": "https://docs.example.com",
 					"default_concurrency": 5,

backend/internal/service/ops_cleanup_service.go

@@ -94,20 +94,19 @@ func (s *OpsCleanupService) Start() {
 			if parsed, err := time.LoadLocation(strings.TrimSpace(s.cfg.Timezone)); err == nil && parsed != nil {
 				loc = parsed
 			}
-		}
-
-		c := cron.New(cron.WithParser(opsCleanupCronParser), cron.WithLocation(loc))
-		id, err := c.AddFunc(schedule, func() { s.runScheduled() })
-		if err != nil {
-			log.Printf("[OpsCleanup] not started (invalid schedule=%q): %v", schedule, err)
-			return
-		}
-		s.cron = c
-		s.entryID = id
-		s.cron.Start()
-		log.Printf("[OpsCleanup] started (schedule=%q tz=%s)", schedule, loc.String())
-	})
-}
+			}
+	
+			c := cron.New(cron.WithParser(opsCleanupCronParser), cron.WithLocation(loc))
+			_, err := c.AddFunc(schedule, func() { s.runScheduled() })
+			if err != nil {
+				log.Printf("[OpsCleanup] not started (invalid schedule=%q): %v", schedule, err)
+				return
+			}
+			s.cron = c
+			s.cron.Start()
+			log.Printf("[OpsCleanup] started (schedule=%q tz=%s)", schedule, loc.String())
+		})
+	}
 
 func (s *OpsCleanupService) Stop() {
 	if s == nil {

backend/internal/service/ops_retry.go

@@ -52,6 +52,7 @@ const (
 type limitedResponseWriter struct {
 	header      http.Header
 	wroteHeader bool
+	status      int
 
 	limit        int
 	totalWritten int64