feat(chat): 캐릭터 폼에 JSON 내보내기/가져오기 기능 추가

- 툴바에 'JSON 다운로드/업로드' 버튼 추가
- buildSerializablePayload, exportToJson, onImportFileChange, applyImportedData 메서드 구현
- 이미지(image, imageUrl) 및 isActive는 직렬화/역직렬화에서 제외
- 업로드 시 버전 검증 및 길이/개수 제한, 중요도(1~10) 보정 적용
- 사용자 알림 메시지(성공/오류) 한글화

src/views/Chat/CharacterForm.vue

@@ -10,6 +10,9 @@
       <v-spacer />
       <v-toolbar-title>{{ isEdit ? '캐릭터 수정' : '캐릭터 등록' }}</v-toolbar-title>
       <v-spacer />
+      <v-btn small outlined color="primary" @click="exportToJson">JSON 다운로드</v-btn>
+      <input ref="importInput" type="file" accept="application/json,.json" style="display:none" @change="onImportFileChange" />
+      <v-btn small color="primary" class="ml-2" @click="$refs.importInput.click()">JSON 업로드</v-btn>
     </v-toolbar>
 
     <v-container>
@@ -1630,6 +1633,147 @@ export default {
       } finally {
         this.isLoading = false;
       }
+    },
+
+    // ===== JSON 내보내기/가져오기 =====
+    buildSerializablePayload() {
+      const c = {
+        ...this.character,
+        tags: this.tags.filter(t => t && typeof t === 'string' && t.trim()),
+        hobbies: [...this.hobbies],
+        values: [...this.values],
+        goals: [...this.goals],
+        relationships: [...this.relationships],
+        personalities: [...this.personalities],
+        backgrounds: [...this.backgrounds],
+        memories: [...this.memories]
+      };
+
+      // 이미지 및 상태 관련 필드 제외
+      delete c.image;
+      delete c.imageUrl;
+      delete c.isActive;
+
+      return {
+        version: 1,
+        ...c
+      };
+    },
+
+    exportToJson() {
+      try {
+        const payload = this.buildSerializablePayload();
+        const json = JSON.stringify(payload, null, 2);
+        const blob = new Blob([json], { type: 'application/json;charset=utf-8' });
+
+        const filenameBase = (this.character.name || 'character').replace(/\s+/g, '_');
+        const link = document.createElement('a');
+        link.href = URL.createObjectURL(blob);
+        link.download = `${filenameBase}.character.json`;
+        document.body.appendChild(link);
+        link.click();
+        document.body.removeChild(link);
+        URL.revokeObjectURL(link.href);
+        this.notifySuccess('JSON 파일로 내보냈습니다.');
+      } catch (e) {
+        console.error(e);
+        this.notifyError('내보내기 중 오류가 발생했습니다.');
+      }
+    },
+
+    onImportFileChange(e) {
+      const file = e.target.files && e.target.files[0];
+      if (!file) return;
+      const reader = new FileReader();
+      reader.onload = () => {
+        try {
+          const text = reader.result;
+          const data = JSON.parse(text);
+          this.applyImportedData(data);
+          this.notifySuccess('JSON 데이터를 불러왔습니다.');
+        } catch (err) {
+          console.error(err);
+          this.notifyError('유효한 JSON 파일이 아닙니다.');
+        } finally {
+          // 동일 파일 재업로드 허용
+          e.target.value = '';
+        }
+      };
+      reader.readAsText(file, 'utf-8');
+    },
+
+    applyImportedData(data) {
+      // 1) 버전/형식 검증
+      if (!data || (data.version !== 1 && data.version !== undefined)) {
+        throw new Error('지원되지 않는 파일 버전입니다.');
+      }
+
+      // 2) 안전한 추출(helper)
+      const arr = (v) => Array.isArray(v) ? v : [];
+      const str = (v) => (v == null ? '' : String(v));
+
+      // 3) 이미지 및 상태 관련 필드 강제 제거 (파일 포맷 요구사항)
+      if (data) {
+        delete data.image;
+        delete data.imageUrl;
+        delete data.isActive;
+      }
+
+      // 4) 기본 필드 주입
+      const patch = {
+        name: str(data.name),
+        description: str(data.description),
+        systemPrompt: str(data.systemPrompt),
+        age: str(data.age),
+        gender: str(data.gender),
+        mbti: str(data.mbti),
+        characterType: str(data.characterType),
+        originalTitle: str(data.originalTitle),
+        originalLink: str(data.originalLink),
+        speechPattern: str(data.speechPattern),
+        speechStyle: str(data.speechStyle),
+        appearance: str(data.appearance)
+      };
+
+      // 5) 배열 필드 주입 + 간단 검증/정제
+      const sanitizeString = (s, max) => String(s || '').trim().substring(0, max);
+
+      this.tags = arr(data.tags).map(t => sanitizeString(t, 50)).slice(0, 20);
+      this.hobbies = arr(data.hobbies).map(h => sanitizeString(h, 100)).slice(0, 10);
+      this.values = arr(data.values).map(v => sanitizeString(v, 100)).slice(0, 10);
+      this.goals = arr(data.goals).map(g => sanitizeString(g, 200)).slice(0, 10);
+
+      this.memories = arr(data.memories).map(m => ({
+        title: sanitizeString(m.title, 100),
+        content: sanitizeString(m.content, 1000),
+        emotion: sanitizeString(m.emotion, 50)
+      })).slice(0, 20);
+
+      this.relationships = arr(data.relationships).map(r => ({
+        personName: sanitizeString(r.personName, 10),
+        relationshipName: sanitizeString(r.relationshipName, 20),
+        description: sanitizeString(r.description, 500),
+        importance: Math.max(1, Math.min(10, parseInt(r.importance || 1))),
+        relationshipType: sanitizeString(r.relationshipType, 10),
+        currentStatus: sanitizeString(r.currentStatus, 10)
+      })).slice(0, 10);
+
+      this.personalities = arr(data.personalities).map(p => ({
+        trait: sanitizeString(p.trait, 100),
+        description: sanitizeString(p.description, 500)
+      })).slice(0, 10);
+
+      this.backgrounds = arr(data.backgrounds).map(b => ({
+        topic: sanitizeString(b.topic, 100),
+        description: sanitizeString(b.description, 1000)
+      })).slice(0, 10);
+
+      // 6) character에 반영 (image는 반드시 null 유지)
+      this.character = {
+        ...this.character,
+        ...patch,
+        image: null
+      };
     }
   }
 }