feat: Agent采集uptime, 后端持久化kernel/uptime/diskIO, 前端磁盘BPS+IOPS展示

- Agent: system.go 添加 readUptime(), SystemStat 携带 Uptime
- Backend: Server 模型新增 Kernel 字段, ReceiveReport 持久化 kernel+uptime
- Backend: /agent/latest 返回 kernel/uptime/port_info/disk_io_info/disk_total
- Frontend: 磁盘监控改为 BPS+IOPS (4张卡片), 系统信息修复内核/运行时长/监听端口/磁盘容量
- 图表单位从 MB/s 改为 KB/s, 添加 formatBPS 工具函数

backend/internal/models/automation.go

@@ -3,7 +3,6 @@ package models
 import (
 	"time"
 
-	"gorm.io/gorm"
 )
 
 // CronJob 定时任务模型
@@ -27,7 +26,6 @@ type CronJob struct {
 	NotifyOn    string         `gorm:"size:32;default:failure" json:"notify_on"` // always, failure, success
 	CreatedAt   time.Time      `json:"created_at"`
 	UpdatedAt   time.Time      `json:"updated_at"`
-	DeletedAt   gorm.DeletedAt `gorm:"index" json:"-"`
 
 	// 关联
 	Script *Script `json:"script,omitempty"`
@@ -54,12 +52,11 @@ type Script struct {
 	UpdatedBy   uint           `json:"updated_by"`
 	CreatedAt   time.Time      `json:"created_at"`
 	UpdatedAt   time.Time      `json:"updated_at"`
-	DeletedAt   gorm.DeletedAt `gorm:"index" json:"-"`
 }
 
 // TableName 表名
 func (Script) TableName() string {
-	return "scripts"
+	return "ops_scripts"
 }
 
 // TaskExecution 任务执行记录
@@ -83,7 +80,7 @@ type TaskExecution struct {
 
 // TableName 表名
 func (TaskExecution) TableName() string {
-	return "task_executions"
+	return "ops_task_executions"
 }
 
 // Playbook Ansible Playbook模型
@@ -103,12 +100,11 @@ type Playbook struct {
 	UpdatedBy   uint           `json:"updated_by"`
 	CreatedAt   time.Time      `json:"created_at"`
 	UpdatedAt   time.Time      `json:"updated_at"`
-	DeletedAt   gorm.DeletedAt `gorm:"index" json:"-"`
 }
 
 // TableName 表名
 func (Playbook) TableName() string {
-	return "playbooks"
+	return "ops_playbooks"
 }
 
 // CreatePlaybookRequest 创建Playbook请求