```

feat: 添加数据库迁移脚本并更新Dockerfile配置

- 在Dockerfile中添加alembic配置文件和目录的复制指令
- 更新alembic/env.py注册新的模块模型：events、workflows、writebacks
- 生成完整的初始数据库schema迁移脚本，包含以下表：
  - approval_requests, attendance_records, audit_logs, domain_events
  - expenses, feishu_event_receipts, fund_accounts, legacy_sync_runs
  - official_writeback_runs, performance_metrics, policies, procurements
  - projects, report_push_runs, risk_event_actions, risk_events
  - standards, suppliers, work_reports, work_tasks, workflow_actions
  - workflow_instances等21个数据表结构定义
- 在API路由器中添加新模块的路由：events、workflows、writebacks、observability
```

app/modules/audit/schemas.py

@@ -17,6 +17,7 @@ class AuditLogCreate(BaseModel):
     request_payload: Any | None = None
     response_payload: Any | None = None
     status: str = AuditStatus.SUCCESS
+    request_id: str | None = None
 
 
 class AuditLogRead(BaseModel):
@@ -32,4 +33,5 @@ class AuditLogRead(BaseModel):
     request_payload: str | None
     response_payload: str | None
     status: str
+    request_id: str | None
     created_at: datetime