fix: 联合调试问题修复 — 预约错误提示 + request 错误提取 + copilot 解包

- ISSUE-APPOINTMENT-001: 后端 DoctorNotFound 改为 Validation 错误（400）
  + 改善错误消息"所选医生暂无医护档案，请联系管理员"
  + 小程序预约创建 catch 传递实际错误消息（不再硬编码"预约失败"）
  + 小程序 request.ts 提取后端 message 字段作为用户提示
- copilot API: listInsights/listRules/getPatientRisk 补齐 data.data 解包
- 移除 error.rs 重复的 AppointmentNotFound 分支

apps/web/src/api/copilot.ts

@@ -36,18 +36,20 @@ export interface CopilotInsight {
 
 // --- API Functions ---
 
-export function getPatientRisk(patientId: string) {
-  return client.get<RiskScore>(`/copilot/patients/${patientId}/risk`);
+export async function getPatientRisk(patientId: string) {
+  const { data } = await client.get<{ success: boolean; data: RiskScore }>(`/copilot/patients/${patientId}/risk`);
+  return data.data;
 }
 
-export function listInsights(params: {
+export async function listInsights(params: {
   patient_id?: string;
   insight_type?: string;
   severity?: string;
   page?: number;
   page_size?: number;
 }) {
-  return client.get<PaginatedResponse<CopilotInsight>>('/copilot/insights', { params });
+  const { data } = await client.get<{ success: boolean; data: PaginatedResponse<CopilotInsight> }>('/copilot/insights', { params });
+  return data.data;
 }
 
 export function dismissInsight(id: string) {
@@ -58,6 +60,7 @@ export function listAlerts(params?: { severity?: string; page?: number; page_siz
   return listInsights({ insight_type: 'anomaly', ...params });
 }
 
-export function listRules(params?: { page?: number; page_size?: number }) {
-  return client.get<PaginatedResponse<Record<string, unknown>>>('/copilot/rules', { params });
+export async function listRules(params?: { page?: number; page_size?: number }) {
+  const { data } = await client.get<{ success: boolean; data: PaginatedResponse<Record<string, unknown>> }>('/copilot/rules', { params });
+  return data.data;
 }