feat: 添加数据库集成、定时任务调度器和事件Hook体系

- 新增数据库配置项(DB_TYPE, DB_HOST, DB_PORT等)，支持MySQL和PostgreSQL
- 集成GORM实现数据库连接和自动迁移功能
- 添加定时任务调度器(cmd/scheduler)，基于robfig/cron实现秒级调度
- 实现事件Hook体系，支持同步/异步处理和优先级排序
- 更新构建脚本，编译server、cli、scheduler三个二进制文件
- 配置systemd服务管理定时任务调度器
- 重构项目结构，新增crontab和hooks目录模块
- 更新README文档，完善各组件使用说明和部署配置

hooks/event.go

@@ -0,0 +1,24 @@
+package hooks
+
+import "context"
+
+// EventType 业务事件类型，按项目需求在此扩展
+type EventType string
+
+// Handler 事件处理器接口
+type Handler interface {
+	Handle(ctx context.Context, event EventType, payload *EventPayload) error
+}
+
+// HandlerFunc 函数适配器，方便用匿名函数注册 handler
+type HandlerFunc func(ctx context.Context, event EventType, payload *EventPayload) error
+
+func (f HandlerFunc) Handle(ctx context.Context, event EventType, payload *EventPayload) error {
+	return f(ctx, event, payload)
+}
+
+// EventPayload 事件携带的上下文信息
+type EventPayload struct {
+	UserID int
+	Extra  map[string]any
+}

hooks/global.go

@@ -0,0 +1,7 @@
+package hooks
+
+var defaultManager = NewManager()
+
+func DefaultManager() *Manager {
+	return defaultManager
+}

hooks/manager.go

@@ -0,0 +1,83 @@
+package hooks
+
+import (
+	"apiServer_service/utils/logger"
+	"context"
+	"fmt"
+	"sort"
+	"sync"
+)
+
+type handlerWithMeta struct {
+	priority int
+	async    bool
+	h        Handler
+}
+
+type Manager struct {
+	mu       sync.RWMutex
+	handlers map[EventType][]handlerWithMeta
+}
+
+func NewManager() *Manager {
+	return &Manager{
+		handlers: make(map[EventType][]handlerWithMeta),
+	}
+}
+
+// Register 同步注册，优先级 0
+func (m *Manager) Register(event EventType, h Handler) {
+	m.RegisterWithOptions(event, 0, false, h)
+}
+
+// RegisterWithPriority 指定优先级（同步）
+func (m *Manager) RegisterWithPriority(event EventType, priority int, h Handler) {
+	m.RegisterWithOptions(event, priority, false, h)
+}
+
+// RegisterAsync 异步注册，优先级 0
+func (m *Manager) RegisterAsync(event EventType, h Handler) {
+	m.RegisterWithOptions(event, 0, true, h)
+}
+
+// RegisterWithOptions 核心注册：优先级 + 同步/异步
+func (m *Manager) RegisterWithOptions(event EventType, priority int, async bool, h Handler) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.handlers[event] = append(m.handlers[event], handlerWithMeta{
+		priority: priority,
+		async:    async,
+		h:        h,
+	})
+}
+
+// Trigger 触发事件，按优先级从高到低执行
+func (m *Manager) Trigger(ctx context.Context, event EventType, payload *EventPayload) {
+	m.mu.RLock()
+	hs := m.handlers[event]
+	m.mu.RUnlock()
+
+	if len(hs) == 0 {
+		return
+	}
+
+	sorted := make([]handlerWithMeta, len(hs))
+	copy(sorted, hs)
+	sort.SliceStable(sorted, func(i, j int) bool {
+		return sorted[i].priority > sorted[j].priority
+	})
+
+	for _, hm := range sorted {
+		if hm.async {
+			go func(hm handlerWithMeta) {
+				if err := hm.h.Handle(ctx, event, payload); err != nil {
+					logger.Error("Hook", fmt.Sprintf("async event=%s err=%v", event, err))
+				}
+			}(hm)
+		} else {
+			if err := hm.h.Handle(ctx, event, payload); err != nil {
+				logger.Error("Hook", fmt.Sprintf("event=%s err=%v", event, err))
+			}
+		}
+	}
+}

hooks/registers/register.go

@@ -0,0 +1,12 @@
+package registers
+
+import (
+	"apiServer_service/hooks"
+)
+
+// RegisterHooks 注册所有事件 handler，新增 hook 在此添加
+func RegisterHooks(m *hooks.Manager) {
+	// 示例：
+	// m.Register(hooks.EventType("order_paid"), hooks.HandlerFunc(OnOrderPaid))
+	// m.RegisterAsync(hooks.EventType("user_registered"), hooks.HandlerFunc(SendWelcomeEmail))
+}