feat: support composite practice questions

apps/taro/src/services/learning.ts

@@ -28,6 +28,39 @@ export interface QuestionItem {
   createdAt?: string;
 }
 
+export interface SubAnswerInput {
+  subQuestionId: string;
+  selectedOptions?: string[];
+  answerText?: string;
+  selfJudgedCorrect?: boolean;
+}
+
+export interface SubAnswerResult {
+  subQuestionId: string;
+  order?: number;
+  type?: string;
+  typeLabel?: string | null;
+  content?: string | null;
+  selectedOptions?: string[];
+  answerText?: string | null;
+  isCorrect?: boolean | null;
+  selfJudged?: boolean;
+  correctOptionIndex?: number | null;
+  correctOptionIndices?: number[];
+  correctAnswerText?: string | null;
+  explanation?: string | null;
+  answered?: boolean;
+  score?: number;
+  totalScore?: number;
+}
+
+export interface AnswerPayload {
+  mode?: string;
+  subAnswers?: SubAnswerInput[];
+  subResults?: SubAnswerResult[];
+  summary?: Record<string, unknown>;
+}
+
 export interface PracticeSession {
   id: string;
   mode: string;
@@ -57,8 +90,11 @@ export interface AnswerResult {
   isCorrect: boolean | null;
   selectedOptions?: string[];
   answerText?: string | null;
+  answerPayload?: AnswerPayload;
   answeredAt?: string;
   selfJudged?: boolean;
+  subResults?: SubAnswerResult[];
+  compositeSummary?: Record<string, unknown>;
 }
 
 export interface PracticeReport {
@@ -153,6 +189,7 @@ export async function submitAnswer(body: {
   selectedOptions?: string[];
   answerText?: string;
   selfJudgedCorrect?: boolean;
+  subAnswers?: SubAnswerInput[];
 }) {
   return apiRequest<{ item: AnswerResult }>('/api/learning/answers', {
     method: 'POST',