feat(miniprogram): 实现知情同意页面 — 查看/撤回/签署

审计后续 H2: 对接后端 3 个知情同意 API 路由。

新增内容:
- services/consent.ts: 类型定义 + listConsents/grantConsent/revokeConsent
- 患者端知情同意列表页: 查看已签署同意书 + 撤回操作
- 路由注册 + "我的"菜单入口

apps/miniprogram/src/services/consent.ts

@@ -0,0 +1,48 @@
+import { api } from './request';
+
+// ── Types ─────────────────────────────────────────────
+
+export interface Consent {
+  id: string;
+  patient_id: string;
+  consent_type: string;
+  consent_scope: string;
+  status: string;
+  granted_at?: string;
+  revoked_at?: string;
+  expiry_date?: string;
+  consent_method?: string;
+  witness_name?: string;
+  notes?: string;
+  created_at: string;
+  updated_at: string;
+  version: number;
+}
+
+// ── Patient-facing API ────────────────────────────────
+
+export async function listConsents(
+  patientId: string,
+  params?: { page?: number; page_size?: number },
+) {
+  return api.get<{ data: Consent[]; total: number }>(
+    `/health/patients/${patientId}/consents`,
+    params,
+  );
+}
+
+export async function grantConsent(data: {
+  patient_id: string;
+  consent_type: string;
+  consent_scope: string;
+  expiry_date?: string;
+  consent_method?: string;
+  witness_name?: string;
+  notes?: string;
+}) {
+  return api.post<Consent>('/health/consents', data);
+}
+
+export async function revokeConsent(id: string, version: number, notes?: string) {
+  return api.put<Consent>(`/health/consents/${id}/revoke`, { version, notes });
+}