```

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/legacy_mysql/service.py

@@ -19,6 +19,13 @@ from app.modules.audit.service import AuditService
 from app.modules.business.constants import BusinessDomain, SourceSystem, StatusValue
 from app.modules.business.models import LegacySyncRun, Project, WorkTask
 from app.modules.business.service import serialize_model
+from app.modules.events.constants import (
+    EventAggregateType,
+    EventPayloadKey,
+    EventSource,
+    EventType,
+)
+from app.modules.events.service import EventService
 from app.modules.legacy_mysql.constants import (
     LEGACY_PROJECT_QUERY_SOURCE,
     LEGACY_PROJECT_SYNC_NOTE,
@@ -491,6 +498,22 @@ class LegacyMySQLService:
                 },
             )
         )
+        EventService(self.db).emit(
+            event_type=EventType.LEGACY_SYNC_COMPLETED,
+            source=EventSource.LEGACY_MYSQL,
+            aggregate_type=EventAggregateType.LEGACY_SYNC_RUN,
+            aggregate_id=sync_run.code,
+            actor=actor,
+            payload={
+                EventPayloadKey.CODE: sync_run.code,
+                EventPayloadKey.DOMAIN: BusinessDomain.PROJECTS,
+                EventPayloadKey.STATUS: sync_run.status,
+                EventPayloadKey.CREATED: created,
+                EventPayloadKey.UPDATED: updated,
+                EventPayloadKey.SKIPPED: skipped,
+            },
+            idempotency_key=f"legacy-sync:{sync_run.code}",
+        )
         return result
 
     def sync_tasks(
@@ -629,4 +652,20 @@ class LegacyMySQLService:
                 },
             )
         )
+        EventService(self.db).emit(
+            event_type=EventType.LEGACY_SYNC_COMPLETED,
+            source=EventSource.LEGACY_MYSQL,
+            aggregate_type=EventAggregateType.LEGACY_SYNC_RUN,
+            aggregate_id=sync_run.code,
+            actor=actor,
+            payload={
+                EventPayloadKey.CODE: sync_run.code,
+                EventPayloadKey.DOMAIN: BusinessDomain.TASKS,
+                EventPayloadKey.STATUS: sync_run.status,
+                EventPayloadKey.CREATED: created,
+                EventPayloadKey.UPDATED: updated,
+                EventPayloadKey.SKIPPED: skipped,
+            },
+            idempotency_key=f"legacy-sync:{sync_run.code}",
+        )
         return result