```

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/core/config.py

@@ -0,0 +1,60 @@
+from functools import lru_cache
+
+from pydantic import Field, field_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """Runtime settings loaded from environment variables and `.env`."""
+
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")
+
+    app_name: str = "Company AI Management Platform"
+    app_env: str = "local"
+    debug: bool = False
+    api_prefix: str = "/api/v1"
+    api_key: str | None = None
+    cors_origins: list[str] = Field(default_factory=lambda: ["*"])
+
+    database_url: str = "mysql+pymysql://root:password@127.0.0.1:3306/company_ai?charset=utf8mb4"
+    legacy_database_url: str | None = None
+    legacy_project_query: str | None = None
+    legacy_project_code_prefix: str = "LEGACY"
+    redis_url: str = "redis://127.0.0.1:6379/0"
+
+    feishu_base_url: str = "https://open.feishu.cn/open-apis"
+    feishu_app_id: str | None = None
+    feishu_app_secret: str | None = None
+    feishu_verification_token: str | None = None
+    feishu_encrypt_key: str | None = None
+    feishu_default_chat_id: str | None = None
+
+    model_provider: str = "noop"
+    openclaw_base_url: str = "http://127.0.0.1:18789"
+    openclaw_api_key: str | None = None
+    hermes_base_url: str = "http://127.0.0.1:8080"
+    hermes_api_key: str | None = None
+    direct_llm_base_url: str = "https://api.openai.com/v1"
+    direct_llm_api_key: str | None = None
+    direct_llm_model: str = "gpt-4.1-mini"
+
+    scheduler_enabled: bool = False
+    daily_brief_cron_hour: int = 9
+    daily_brief_cron_minute: int = 0
+    weekly_project_report_day_of_week: str = "mon"
+    weekly_project_report_cron_hour: int = 9
+    weekly_project_report_cron_minute: int = 30
+
+    @field_validator("cors_origins", mode="before")
+    @classmethod
+    def parse_cors_origins(cls, value: str | list[str]) -> list[str]:
+        if isinstance(value, list):
+            return value
+        return [item.strip() for item in value.split(",") if item.strip()]
+
+
+@lru_cache
+def get_settings() -> Settings:
+    """Return cached application settings."""
+
+    return Settings()