feat(sign): 补齐医护端与患者端签署流程

patient-h5/src/types/signing.ts

@@ -1,4 +1,9 @@
-import type { SignDeliveryChannel, SignatureUploadResponse, SigningContextField } from '@/api/types'
+import type {
+  SignDeliveryChannel,
+  SignatureFieldPosition,
+  SignatureUploadResponse,
+  SigningContextField,
+} from '@/api/types'
 
 export type SignerRelation = '本人' | '父亲' | '母亲' | '其他监护人' | '其他'
 
@@ -34,6 +39,8 @@ export interface SignFlowState {
   staffAnswers: Record<string, string>
   /** 患者端可交互的字段。按约定只有主签名位（`id === 'signature'`） */
   fields: SigningContextField[]
+  /** PDF points and page number supplied by the task's frozen template version. */
+  signatureFields: SignatureFieldPosition[]
   /** 有没有真的拿到正文 —— 没拿到就不该让患者签 */
   documentLoaded: boolean
   documentError: string