feat: 咨询消息轮询优化 — Web 自动刷新 + 患者端聊天详情页

Web 端:
- ConsultationDetail 添加 10s 自动轮询新消息（after_id 增量拉取）
- consultations API 补充 after_id 参数

小程序患者端:
- 新增 consultation service 消息 API（listMessages/sendMessage/markSessionRead）
- 新增聊天详情页（8s 轮询 + 发送消息 + 自动标记已读）
- 咨询列表页点击跳转详情页（替换"即将上线"占位）

apps/miniprogram/src/services/consultation.ts

@@ -13,6 +13,17 @@ export interface ConsultationSession {
   created_at: string;
 }
 
+export interface ConsultationMessage {
+  id: string;
+  session_id: string;
+  sender_id: string;
+  sender_role: string;
+  content_type: string;
+  content: string;
+  is_read: boolean;
+  created_at: string;
+}
+
 export async function listConsultations(params?: {
   page?: number;
   page_size?: number;
@@ -22,3 +33,30 @@ export async function listConsultations(params?: {
     params,
   );
 }
+
+export async function getSession(sessionId: string) {
+  return api.get<ConsultationSession>(`/health/consultation-sessions/${sessionId}`);
+}
+
+export async function listMessages(sessionId: string, params?: {
+  page?: number;
+  page_size?: number;
+  after_id?: string;
+}) {
+  return api.get<{ data: ConsultationMessage[]; total: number }>(
+    `/health/consultation-sessions/${sessionId}/messages`,
+    params,
+  );
+}
+
+export async function sendMessage(sessionId: string, content: string, contentType = 'text') {
+  return api.post<ConsultationMessage>('/health/consultation-messages', {
+    session_id: sessionId,
+    content_type: contentType,
+    content,
+  });
+}
+
+export async function markSessionRead(sessionId: string) {
+  return api.put<void>(`/health/consultation-sessions/${sessionId}/read`);
+}