```

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/api/router.py

@@ -6,10 +6,14 @@ from app.modules.approvals.routes import router as approvals_router
 from app.modules.audit.routes import router as audit_router
 from app.modules.business.routes import router as business_router
 from app.modules.dashboard.routes import router as dashboard_router
+from app.modules.events.routes import router as events_router
 from app.modules.feishu.routes import router as feishu_router
 from app.modules.legacy_mysql.routes import router as legacy_mysql_router
+from app.modules.observability.routes import router as observability_router
 from app.modules.reports.routes import router as reports_router
 from app.modules.risk.routes import router as risk_router
+from app.modules.workflows.routes import router as workflows_router
+from app.modules.writebacks.routes import router as writebacks_router
 
 api_router = APIRouter()
 
@@ -30,3 +34,7 @@ api_router.include_router(approvals_router, prefix="/approvals", tags=["approval
 api_router.include_router(reports_router, prefix="/reports", tags=["reports"])
 api_router.include_router(risk_router, prefix="/risks", tags=["risks"])
 api_router.include_router(audit_router, prefix="/audit", tags=["audit"])
+api_router.include_router(events_router, prefix="/events", tags=["events"])
+api_router.include_router(workflows_router, prefix="/workflows", tags=["workflows"])
+api_router.include_router(writebacks_router, prefix="/writebacks", tags=["writebacks"])
+api_router.include_router(observability_router, tags=["observability"])