```

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/models.py

@@ -22,4 +22,5 @@ class AuditLog(Base):
     request_payload: Mapped[str | None] = mapped_column(Text, nullable=True)
     response_payload: Mapped[str | None] = mapped_column(Text, nullable=True)
     status: Mapped[str] = mapped_column(String(32), default=AuditStatus.SUCCESS, index=True)
+    request_id: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)
     created_at: Mapped[datetime] = mapped_column(DateTime, default=utc_now, index=True)