```

feat: 添加AI记忆模块和事件调度系统

- 新增AI记忆模块，支持本地记忆召回和自动写入功能
- 实现事件调度系统，支持批量处理待定事件和重试机制
- 集成心跳监控机制，跟踪API、调度器和工作节点状态
- 扩展仪表板数据统计，包含AI记忆条目和心跳概要
- 添加企业运营分析报告功能，提供财务、采购等多维度分析
- 更新配置设置，增加事件调度和AI记忆相关参数
- 优化任务队列，添加事件分发任务类型
- 扩展审计日志，记录AI记忆操作和事件调度行为
- 实现领域事件模型，支持事件持久化和状态管理
- 添加观察性服务，监控系统组件健康状况
```

app/modules/observability/constants.py

@@ -9,6 +9,10 @@ class ObservabilityKey(StrEnum):
     REDIS = "redis"
     EVENTS = "events"
     WORKFLOWS = "workflows"
+    AI_MEMORY = "ai_memory"
+    HEARTBEATS = "heartbeats"
+    SCHEDULER = "scheduler"
+    WORKER = "worker"
 
 
 class ObservabilityStatus(StrEnum):
@@ -20,6 +24,23 @@ class ObservabilityStatus(StrEnum):
 
 class ObservabilityMetricKey(StrEnum):
     ERROR = "error"
+    ITEMS = "items"
+    COMPONENT = "component"
+    INSTANCE_ID = "instance_id"
     PENDING = "pending"
     FAILED = "failed"
     RUNNING = "running"
+    TOTAL = "total"
+    ACTIVE = "active"
+    STALE = "stale"
+    LAST_SEEN_AT = "last_seen_at"
+
+
+class HeartbeatComponent(StrEnum):
+    API = "api"
+    SCHEDULER = "scheduler"
+    WORKER = "worker"
+
+
+class HeartbeatStatus(StrEnum):
+    OK = "ok"