```

refactor(api): 使用常量替代硬编码字符串

- 在health_check接口中使用ApiResponseKey.STATUS和ApiStatus.OK常量
- 替换硬编码的状态返回值为枚举常量

refactor(core): 配置模块错误信息统一使用常量

- 从constants模块导入ConfigErrorDetail并替换CORS_ORIGINS和LEGACY_ALLOWED_QUERIES的验证错误信息
- 配置类中的默认值使用constants中定义的常量

feat(constants): 添加API响应、安全错误和配置错误常量类

- 新增ApiResponseKey用于API状态键名
- 新增ApiStatus用于API状态值
- 新增SecurityErrorDetail用于安全认证错误详情
- 新增ConfigErrorDetail用于配置验证错误详情
- 添加DEFAULT_MODEL_PROVIDER和DEFAULT_OPENCLAW_ACTION_JSON常量

refactor(security): 安全认证模块使用错误常量

- 将硬编码的安全错误信息替换为SecurityErrorDetail常量
- 包括API密钥、审批密钥和审计密钥的相关错误信息

refactor(ai-agent): AI代理适配器改进错误处理

- 将HTTP状态码替换为FastAPI状态常量
- 添加OpenClaw工具和操作的错误常量
- 修复健康检查和工具调用中的状态码比较逻辑
- 添加AIToolAuditKey用于工具审计键名

feat(ai-agent): 扩展AI代理常量定义

- 新增AIToolAuditKey用于工具审计字段
- 添加OpenClaw相关的错误常量如OPENCLAW_CHAT_PROVIDER_REQUIRED等
- 添加UNSUPPORTED_AI_SKILL_TEMPLATE模板字符串

refactor(approvals): 审批模块常量化重构

- 新增ApprovalPayloadKey用于审批载荷字段
- 添加approval_action函数和APPROVAL_ACTION_SEPARATOR分隔符
- 使用常量替换字面量值

feat(audit): 审计模块新增飞书事件动作类型

- 添加FEISHU_WEBHOOK_EVENT和FEISHU_LONG_CONNECTION_EVENT审计动作

refactor(business): 业务模块全面常量化

- 新增BusinessDomain枚举包含所有业务域
- 添加BusinessResponseKey、BusinessPayloadKey等常量类
- 重构DOMAIN_MODELS为frozenset以提高性能
- 添加normalize_domain等辅助函数用于域标准化
- 使用常量替换路由和业务服务中的硬编码字符串
- 添加业务错误常量和字段验证模板

refactor(feishu): 飞书客户端错误处理优化

- 将HTTP状态码替换为FastAPI标准状态常量
- 改进错误处理的一致性

refactor(approvals): 审批服务使用新常量结构

- 使用ApprovalPayloadKey常量重构载荷字段
- 使用approval_action函数统一动作命名格式
- 优化高风险域判断逻辑
```

app/modules/risk/constants.py

@@ -0,0 +1,66 @@
+from enum import StrEnum
+
+from app.modules.business.constants import RiskLevel
+
+
+class RiskSummaryKey(StrEnum):
+    RISK_LEVEL = "risk_level"
+    RISK_SCORE = "risk_score"
+    OVERDUE_TASKS = "overdue_tasks"
+    DELAYED_PROJECTS = "delayed_projects"
+    OVER_BUDGET_PROJECTS = "over_budget_projects"
+    FUND_RISKS = "fund_risks"
+    SUPPLIER_RISKS = "supplier_risks"
+    OPEN_EVENTS = "open_events"
+
+
+class RiskGenerationResultKey(StrEnum):
+    CREATED = "created"
+    UPDATED = "updated"
+    SKIPPED = "skipped"
+    ITEMS = "items"
+    ACTION = "action"
+    RISK_EVENT = "risk_event"
+
+
+class RiskGenerationAction(StrEnum):
+    CREATED = "created"
+    UPDATED = "updated"
+    SKIPPED = "skipped"
+
+
+class RiskEventPayloadKey(StrEnum):
+    CODE = "code"
+    TITLE = "title"
+    RISK_TYPE = "risk_type"
+    RISK_LEVEL = "risk_level"
+    STATUS = "status"
+    SOURCE_DOMAIN = "source_domain"
+    SOURCE_RECORD_ID = "source_record_id"
+    PROJECT_CODE = "project_code"
+    OWNER = "owner"
+    DUE_DATE = "due_date"
+    DETECTED_AT = "detected_at"
+    DESCRIPTION = "description"
+    MITIGATION = "mitigation"
+    EVIDENCE = "evidence"
+
+
+RISK_SCORE_WEIGHTS = {
+    RiskSummaryKey.OVERDUE_TASKS: 1,
+    RiskSummaryKey.DELAYED_PROJECTS: 3,
+    RiskSummaryKey.OVER_BUDGET_PROJECTS: 4,
+    RiskSummaryKey.FUND_RISKS: 5,
+    RiskSummaryKey.SUPPLIER_RISKS: 3,
+    RiskSummaryKey.OPEN_EVENTS: 2,
+}
+RISK_LEVEL_HIGH_THRESHOLD = 15
+RISK_LEVEL_MEDIUM_THRESHOLD = 5
+
+
+def risk_level_for_score(score: int) -> RiskLevel:
+    if score >= RISK_LEVEL_HIGH_THRESHOLD:
+        return RiskLevel.HIGH
+    if score >= RISK_LEVEL_MEDIUM_THRESHOLD:
+        return RiskLevel.MEDIUM
+    return RiskLevel.LOW