feat(survey): lib/survey/types — SurveyStep, SurveyResponse, SavedProgress

7 질문 step 정의 + 응답 객체 타입. survey_responses 테이블과 1:1 대응.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/survey/types.ts

@@ -0,0 +1,51 @@
+/**
+ * CONTOUR 설문 타입.
+ * survey_responses 테이블 스키마와 1:1 대응.
+ */
+
+export type SurveyStep =
+  | 'intro'
+  | 'q1'
+  | 'q2'
+  | 'q3'
+  | 'q4'
+  | 'q5'
+  | 'q6'
+  | 'q7'
+  | 'thanks';
+
+export const QUESTION_STEPS: SurveyStep[] = ['q1', 'q2', 'q3', 'q4', 'q5', 'q6', 'q7'];
+export const TOTAL_QUESTIONS = QUESTION_STEPS.length;  // 7
+
+export interface SurveyResponse {
+  // Q1
+  age_range?: string;
+  status?: string;
+  // Q2
+  awareness_freq?: string;
+  // Q3
+  tools_used?: string[];
+  tools_other?: string;
+  // Q4
+  cost_range?: string;
+  // Q5
+  best_tool?: string;
+  best_satisfy?: number;
+  // Q6
+  free_opinion?: string;
+  // Q7
+  email?: string;
+  // 메타 (제출 시 자동 채워짐)
+  user_agent?: string;
+  referrer?: string;
+  utm_source?: string;
+  utm_medium?: string;
+  utm_campaign?: string;
+  completion_seconds?: number;
+}
+
+export interface SavedProgress {
+  step: SurveyStep;
+  response: SurveyResponse;
+  startedAt: number;  // ms epoch
+}