```

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/feishu/client.py

@@ -0,0 +1,91 @@
+import json
+import time
+from typing import Any
+
+import httpx
+from fastapi import HTTPException
+
+from app.core.config import get_settings
+
+
+class FeishuClient:
+    """Small Feishu Open Platform client for tenant token and message APIs."""
+
+    def __init__(self) -> None:
+        self.settings = get_settings()
+        self._tenant_access_token: str | None = None
+        self._token_expires_at: float = 0
+
+    def _is_configured(self) -> bool:
+        return bool(self.settings.feishu_app_id and self.settings.feishu_app_secret)
+
+    def _get_tenant_access_token(self) -> str:
+        if not self._is_configured():
+            raise HTTPException(status_code=503, detail="Feishu app credentials are not configured")
+        if self._tenant_access_token and time.time() < self._token_expires_at:
+            return self._tenant_access_token
+
+        url = f"{self.settings.feishu_base_url}/auth/v3/tenant_access_token/internal"
+        payload = {
+            "app_id": self.settings.feishu_app_id,
+            "app_secret": self.settings.feishu_app_secret,
+        }
+        with httpx.Client(timeout=20) as client:
+            response = client.post(url, json=payload)
+            response.raise_for_status()
+            data = response.json()
+        if data.get("code") != 0:
+            raise HTTPException(status_code=502, detail={"feishu_error": data})
+        self._tenant_access_token = data["tenant_access_token"]
+        self._token_expires_at = time.time() + int(data.get("expire", 7200)) - 300
+        return self._tenant_access_token
+
+    def send_message(
+        self,
+        receive_id: str,
+        receive_id_type: str,
+        msg_type: str,
+        content: dict[str, Any],
+    ) -> dict[str, Any]:
+        token = self._get_tenant_access_token()
+        url = f"{self.settings.feishu_base_url}/im/v1/messages"
+        headers = {"Authorization": f"Bearer {token}"}
+        params = {"receive_id_type": receive_id_type}
+        payload = {
+            "receive_id": receive_id,
+            "msg_type": msg_type,
+            "content": json.dumps(content, ensure_ascii=False),
+        }
+        with httpx.Client(timeout=20) as client:
+            response = client.post(url, headers=headers, params=params, json=payload)
+            response.raise_for_status()
+            data = response.json()
+        return data
+
+    def send_text(
+        self,
+        text: str,
+        receive_id: str | None = None,
+        receive_id_type: str = "chat_id",
+    ) -> dict:
+        chat_id = receive_id or self.settings.feishu_default_chat_id
+        if not chat_id:
+            raise HTTPException(
+                status_code=400,
+                detail="receive_id or FEISHU_DEFAULT_CHAT_ID is required",
+            )
+        return self.send_message(chat_id, receive_id_type, "text", {"text": text})
+
+    def send_card(
+        self,
+        card: dict[str, Any],
+        receive_id: str | None = None,
+        receive_id_type: str = "chat_id",
+    ) -> dict:
+        chat_id = receive_id or self.settings.feishu_default_chat_id
+        if not chat_id:
+            raise HTTPException(
+                status_code=400,
+                detail="receive_id or FEISHU_DEFAULT_CHAT_ID is required",
+            )
+        return self.send_message(chat_id, receive_id_type, "interactive", card)