Phase 4: upload, LLM extraction, import review flow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/models/models.go

@@ -44,6 +44,25 @@ type TestAnswer struct {
 	AnsweredAt       sql.NullTime
 }
 
+// Draft holds LLM-extracted questions pending user review before import.
+type Draft struct {
+	ID        string
+	UserID    int64
+	Source    string
+	Questions []DraftQuestion
+	CreatedAt time.Time
+}
+
+type DraftQuestion struct {
+	Text    string        `json:"text"`
+	Answers []DraftAnswer `json:"answers"`
+}
+
+type DraftAnswer struct {
+	Text      string `json:"text"`
+	IsCorrect bool   `json:"is_correct"`
+}
+
 type UserQuestionStat struct {
 	UserID       int64
 	QuestionID   string