```

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/approvals/constants.py

@@ -19,3 +19,19 @@ class ApprovalErrorDetail(StrEnum):
     SELF_APPROVAL = "Approval applicant cannot approve their own ticket"
     NOT_APPROVED = "Approval ticket is not approved for this change"
     PAYLOAD_MISMATCH = "Approval ticket payload does not match this change"
+
+
+class ApprovalPayloadKey(StrEnum):
+    TICKET_ID = "ticket_id"
+    STATUS = "status"
+    COMMENT = "comment"
+    RECORD_ID = "record_id"
+    USED_BY = "used_by"
+    USED_AT = "used_at"
+
+
+APPROVAL_ACTION_SEPARATOR = ":"
+
+
+def approval_action(action: ApprovalActionValue | str, domain: str) -> str:
+    return f"{action}{APPROVAL_ACTION_SEPARATOR}{domain}"

app/modules/approvals/service.py

@@ -13,7 +13,9 @@ from app.core.time import utc_now
 from app.modules.approvals.constants import (
     ApprovalActionValue,
     ApprovalErrorDetail,
+    ApprovalPayloadKey,
     ApprovalStatus,
+    approval_action,
 )
 from app.modules.approvals.models import ApprovalRequest
 from app.modules.approvals.schemas import ApprovalCreate
@@ -51,7 +53,10 @@ class ApprovalService:
                 target_id=payload.record_id,
                 risk_level=AuditRiskLevel.MEDIUM,
                 request_payload=payload.model_dump(),
-                response_payload={"ticket_id": ticket.ticket_id, "status": ticket.status},
+                response_payload={
+                    ApprovalPayloadKey.TICKET_ID: ticket.ticket_id,
+                    ApprovalPayloadKey.STATUS: ticket.status,
+                },
             )
         )
         return ticket
@@ -109,8 +114,11 @@ class ApprovalService:
                 target_type=ticket.domain,
                 target_id=ticket.record_id,
                 risk_level=AuditRiskLevel.HIGH,
-                request_payload={"ticket_id": ticket_id, "comment": comment},
-                response_payload={"status": ticket.status},
+                request_payload={
+                    ApprovalPayloadKey.TICKET_ID: ticket_id,
+                    ApprovalPayloadKey.COMMENT: comment,
+                },
+                response_payload={ApprovalPayloadKey.STATUS: ticket.status},
             )
         )
         return ticket
@@ -137,12 +145,12 @@ class ApprovalService:
             )
         used_at = utc_now()
         values: dict[str, Any] = {
-            "status": ApprovalStatus.USED,
-            "used_by": actor,
-            "used_at": used_at,
+            ApprovalPayloadKey.STATUS: ApprovalStatus.USED,
+            ApprovalPayloadKey.USED_BY: actor,
+            ApprovalPayloadKey.USED_AT: used_at,
         }
         if record_id is not None and not ticket.record_id:
-            values["record_id"] = str(record_id)
+            values[ApprovalPayloadKey.RECORD_ID] = str(record_id)
         result = self.db.execute(
             update(ApprovalRequest)
             .where(
@@ -188,7 +196,7 @@ class ApprovalService:
         return ticket.action in {
             action,
             ApprovalActionValue.UPDATE,
-            f"{ApprovalActionValue.UPDATE}:{domain}",
+            approval_action(ApprovalActionValue.UPDATE, domain),
         }