```

refactor(core,ai): 调整模块导入路径并移除废弃文件

- 修复 scheduler.py 中的导入路径错误，将 reports.service
  改为 reports.services
- 移除废弃的 app/core/background/task_queue.py 文件
- 移除废弃的 app/modules/ai_agent/adapters.py 文件
- 修复 ai_memory/service.py 中的导入路径错误，将
  events.service 改为 events.services
```

app/modules/business/models/risks.py

@@ -0,0 +1,53 @@
+from datetime import date, datetime
+
+from sqlalchemy import JSON, Date, DateTime, Integer, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.constants import ActorValue
+from app.core.database import Base
+from app.core.utils.time import utc_now
+from app.modules.business.constants import (
+    RiskLevel,
+    StatusValue,
+)
+from app.modules.business.models.common import TimestampMixin
+
+
+class RiskEvent(Base, TimestampMixin):
+    __tablename__ = "risk_events"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    code: Mapped[str] = mapped_column(String(64), unique=True, index=True)
+    title: Mapped[str] = mapped_column(String(255), index=True)
+    risk_type: Mapped[str] = mapped_column(String(64), index=True)
+    risk_level: Mapped[str] = mapped_column(String(32), default=RiskLevel.MEDIUM, index=True)
+    status: Mapped[str] = mapped_column(String(32), default=StatusValue.OPEN, index=True)
+    source_domain: Mapped[str] = mapped_column(String(128), index=True)
+    source_record_id: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
+    project_code: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)
+    owner: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
+    detected_at: Mapped[datetime] = mapped_column(DateTime, default=utc_now, index=True)
+    due_date: Mapped[date | None] = mapped_column(Date, nullable=True, index=True)
+    assigned_to: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
+    resolved_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    closed_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    closed_reason: Mapped[str | None] = mapped_column(Text, nullable=True)
+    review_summary: Mapped[str | None] = mapped_column(Text, nullable=True)
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    mitigation: Mapped[str | None] = mapped_column(Text, nullable=True)
+    evidence: Mapped[dict | None] = mapped_column(JSON, nullable=True)
+
+class RiskEventAction(Base):
+    __tablename__ = "risk_event_actions"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    code: Mapped[str] = mapped_column(String(64), unique=True, index=True)
+    risk_event_id: Mapped[int] = mapped_column(Integer, index=True)
+    action: Mapped[str] = mapped_column(String(64), index=True)
+    actor: Mapped[str] = mapped_column(String(128), default=ActorValue.SYSTEM, index=True)
+    from_status: Mapped[str | None] = mapped_column(String(32), nullable=True)
+    to_status: Mapped[str | None] = mapped_column(String(32), nullable=True)
+    assigned_to: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
+    comment: Mapped[str | None] = mapped_column(Text, nullable=True)
+    payload: Mapped[dict | None] = mapped_column(JSON, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=utc_now, index=True)