```

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/ai_agent/adapters.py

@@ -2,7 +2,7 @@ from abc import ABC, abstractmethod
 from typing import Any
 
 import httpx
-from fastapi import HTTPException
+from fastapi import HTTPException, status
 
 from app.core.config import Settings, get_settings
 from app.modules.ai_agent.constants import (
@@ -11,7 +11,10 @@ from app.modules.ai_agent.constants import (
     COMPANY_MANAGEMENT_SYSTEM_INSTRUCTIONS,
     DIRECT_LLM_API_KEY_MISSING,
     NOOP_PROVIDER_ANSWER,
+    OPENCLAW_ACTION_NOT_ALLOWED,
+    OPENCLAW_CHAT_PROVIDER_REQUIRED,
     OPENCLAW_HERMES_PIPELINE,
+    OPENCLAW_TOOL_NOT_ALLOWED,
     OPENCLAW_TOOL_COMPLETED_ANSWER,
     UNEXPECTED_HERMES_RESPONSE,
     AIDefault,
@@ -67,12 +70,8 @@ class OpenClawAdapter(AIAdapter):
         tool = context.get(AIContextKey.OPENCLAW_TOOL)
         if not tool:
             raise HTTPException(
-                status_code=400,
-                detail=(
-                    "OpenClaw Gateway is not configured as a chat provider. "
-                    "Provide context.openclaw_tool for /tools/invoke, or use "
-                    "MODEL_PROVIDER=hermes/openclaw_hermes for AI answers."
-                ),
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail=OPENCLAW_CHAT_PROVIDER_REQUIRED,
             )
         result = self.invoke_tool(
             tool=str(tool),
@@ -96,7 +95,10 @@ class OpenClawAdapter(AIAdapter):
             healthz = client.get(f"{base_url}{AIHttpPath.HEALTHZ}", headers=headers)
             readyz = client.get(f"{base_url}{AIHttpPath.READYZ}", headers=headers)
         return {
-            AIResponseKey.OK: healthz.status_code < 400 and readyz.status_code < 400,
+            AIResponseKey.OK: (
+                healthz.status_code < status.HTTP_400_BAD_REQUEST
+                and readyz.status_code < status.HTTP_400_BAD_REQUEST
+            ),
             AIResponseKey.BASE_URL: base_url,
             AIResponseKey.HEALTHZ: _response_payload(healthz),
             AIResponseKey.READYZ: _response_payload(readyz),
@@ -121,8 +123,11 @@ class OpenClawAdapter(AIAdapter):
         url = f"{self._base_url()}{AIHttpPath.TOOLS_INVOKE}"
         with httpx.Client(timeout=120, trust_env=False) as client:
             response = client.post(url, json=payload, headers=self._headers())
-        if response.status_code >= 400:
-            raise HTTPException(status_code=502, detail={AIErrorKey.OPENCLAW: response.text})
+        if response.status_code >= status.HTTP_400_BAD_REQUEST:
+            raise HTTPException(
+                status_code=status.HTTP_502_BAD_GATEWAY,
+                detail={AIErrorKey.OPENCLAW: response.text},
+            )
         return _response_payload(response)
 
     def _base_url(self) -> str:
@@ -138,9 +143,15 @@ class OpenClawAdapter(AIAdapter):
 
     def _ensure_tool_allowed(self, tool: str, action: str) -> None:
         if tool not in set(self.settings.openclaw_allowed_tools):
-            raise HTTPException(status_code=403, detail="OpenClaw tool is not allowed")
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail=OPENCLAW_TOOL_NOT_ALLOWED,
+            )
         if action not in set(self.settings.openclaw_allowed_actions):
-            raise HTTPException(status_code=403, detail="OpenClaw action is not allowed")
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail=OPENCLAW_ACTION_NOT_ALLOWED,
+            )
 
 
 class HermesAdapter(AIAdapter):
@@ -167,8 +178,11 @@ class HermesAdapter(AIAdapter):
         }
         with httpx.Client(timeout=300, trust_env=False) as client:
             response = client.post(url, json=payload, headers=headers)
-        if response.status_code >= 400:
-            raise HTTPException(status_code=502, detail={AIErrorKey.HERMES: response.text})
+        if response.status_code >= status.HTTP_400_BAD_REQUEST:
+            raise HTTPException(
+                status_code=status.HTTP_502_BAD_GATEWAY,
+                detail={AIErrorKey.HERMES: response.text},
+            )
         data = _chat_completion_payload(response, AIErrorKey.HERMES)
         try:
             answer = data[AIHttpPayloadKey.CHOICES][0][AIHttpPayloadKey.MESSAGE][
@@ -176,7 +190,7 @@ class HermesAdapter(AIAdapter):
             ]
         except (KeyError, IndexError, TypeError) as exc:
             raise HTTPException(
-                status_code=502,
+                status_code=status.HTTP_502_BAD_GATEWAY,
                 detail={
                     AIErrorKey.HERMES: UNEXPECTED_HERMES_RESPONSE,
                     AIResponseKey.RAW: data,
@@ -196,7 +210,7 @@ class HermesAdapter(AIAdapter):
         with httpx.Client(timeout=5, trust_env=False) as client:
             response = client.get(url, headers=headers)
         return {
-            AIResponseKey.OK: response.status_code < 400,
+            AIResponseKey.OK: response.status_code < status.HTTP_400_BAD_REQUEST,
             AIResponseKey.BASE_URL: self.settings.hermes_base_url.rstrip("/"),
             AIResponseKey.HEALTH: _response_payload(response),
         }
@@ -267,7 +281,7 @@ class OpenClawHermesAdapter(AIAdapter):
             raise
         except Exception as exc:
             raise HTTPException(
-                status_code=502,
+                status_code=status.HTTP_502_BAD_GATEWAY,
                 detail={AIErrorKey.OPENCLAW: _error_detail(exc)},
             ) from exc
         return result
@@ -334,7 +348,10 @@ class DirectLLMAdapter(AIAdapter):
 
     def ask(self, prompt: str, context: dict[str, Any] | None = None) -> dict[str, Any]:
         if not self.settings.direct_llm_api_key:
-            raise HTTPException(status_code=503, detail=DIRECT_LLM_API_KEY_MISSING)
+            raise HTTPException(
+                status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+                detail=DIRECT_LLM_API_KEY_MISSING,
+            )
         url = f"{self.settings.direct_llm_base_url.rstrip('/')}{AIHttpPath.CHAT_COMPLETIONS}"
         headers = {
             AIHttpHeader.AUTHORIZATION: AUTHORIZATION_BEARER_TEMPLATE.format(
@@ -347,8 +364,11 @@ class DirectLLMAdapter(AIAdapter):
         }
         with httpx.Client(timeout=60, trust_env=False) as client:
             response = client.post(url, json=payload, headers=headers)
-        if response.status_code >= 400:
-            raise HTTPException(status_code=502, detail={AIErrorKey.DIRECT_LLM: response.text})
+        if response.status_code >= status.HTTP_400_BAD_REQUEST:
+            raise HTTPException(
+                status_code=status.HTTP_502_BAD_GATEWAY,
+                detail={AIErrorKey.DIRECT_LLM: response.text},
+            )
         data = _chat_completion_payload(response, AIErrorKey.DIRECT_LLM)
         try:
             answer = data[AIHttpPayloadKey.CHOICES][0][AIHttpPayloadKey.MESSAGE][
@@ -356,7 +376,7 @@ class DirectLLMAdapter(AIAdapter):
             ]
         except (KeyError, IndexError, TypeError) as exc:
             raise HTTPException(
-                status_code=502,
+                status_code=status.HTTP_502_BAD_GATEWAY,
                 detail={
                     AIErrorKey.DIRECT_LLM: UNEXPECTED_HERMES_RESPONSE,
                     AIResponseKey.RAW: data,
@@ -404,7 +424,7 @@ def _chat_completion_payload(response: httpx.Response, error_key: AIErrorKey) ->
         return response.json()
     except ValueError as exc:
         raise HTTPException(
-            status_code=502,
+            status_code=status.HTTP_502_BAD_GATEWAY,
             detail={
                 error_key: UNEXPECTED_HERMES_RESPONSE,
                 AIResponseKey.RAW: {AIResponseKey.TEXT: response.text},