```

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
```

alembic/env.py

@@ -8,7 +8,10 @@ from app.core.db_base import Base
 from app.modules.approvals import models as approval_models
 from app.modules.audit import models as audit_models
 from app.modules.business import models as business_models
+from app.modules.events import models as event_models
 from app.modules.feishu import models as feishu_models
+from app.modules.workflows import models as workflow_models
+from app.modules.writebacks import models as writeback_models
 
 config = context.config
 
@@ -23,7 +26,10 @@ _REGISTERED_MODEL_MODULES = (
     approval_models,
     audit_models,
     business_models,
+    event_models,
     feishu_models,
+    workflow_models,
+    writeback_models,
 )