```

feat: 添加公司AI管理平台基础架构

添加了完整的FastAPI后端项目结构，包括：
- 环境配置文件(.env.example)和项目说明文档(README.md、AGENTS.md)
- Dockerfile用于容器化部署
- 核心基础设施：配置管理、数据库连接、调度器、安全认证
- 模块化设计：AI代理、审批流程、审计日志、业务台账等功能模块
- 支持多数据库连接(主库和遗留系统只读库)
- AI适配器支持OpenClaw、Hermes、OpenAI兼容接口
- 飞书集成、报表生成、风险监控等企业级功能
- 完整的依赖管理和测试指南
```

app/modules/approvals/models.py

@@ -0,0 +1,29 @@
+from datetime import datetime
+
+from sqlalchemy import DateTime, Integer, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.database import Base
+
+
+class ApprovalRequest(Base):
+    __tablename__ = "approval_requests"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    ticket_id: Mapped[str] = mapped_column(String(64), unique=True, index=True)
+    domain: Mapped[str] = mapped_column(String(128), index=True)
+    record_id: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
+    action: Mapped[str] = mapped_column(String(128), index=True)
+    applicant: Mapped[str] = mapped_column(String(128), default="api", index=True)
+    approver: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
+    status: Mapped[str] = mapped_column(String(32), default="pending", index=True)
+    reason: Mapped[str | None] = mapped_column(Text, nullable=True)
+    payload: Mapped[str | None] = mapped_column(Text, nullable=True)
+    decision_comment: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, index=True)
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        default=datetime.utcnow,
+        onupdate=datetime.utcnow,
+    )
+    decided_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)