feat(original): 원작

- 등록, 수정, 삭제
- 캐릭터 연결, 해제 기능 추가

src/api/original.js

@@ -0,0 +1,80 @@
+import Vue from 'vue';
+
+// 공통: 빈 문자열 -> null
+function toNullIfBlank(value) {
+  if (typeof value === 'string') {
+    return value.trim() === '' ? null : value;
+  }
+  return value === '' ? null : value;
+}
+
+// 원작 리스트
+export async function getOriginalList(page = 1, size = 20) {
+  return Vue.axios.get('/admin/chat/original/list', {
+    params: { page: page - 1, size }
+  })
+}
+
+// 원작 등록
+export async function createOriginal(data) {
+  const formData = new FormData();
+  if (data.image) formData.append('image', data.image);
+  const request = {
+    title: toNullIfBlank(data.title),
+    contentType: toNullIfBlank(data.contentType),
+    category: toNullIfBlank(data.category),
+    isAdult: !!data.isAdult,
+    description: toNullIfBlank(data.description),
+    originalLink: toNullIfBlank(data.originalLink)
+  };
+  formData.append('request', JSON.stringify(request));
+  return Vue.axios.post('/admin/chat/original/register', formData, {
+    headers: { 'Content-Type': 'multipart/form-data' }
+  })
+}
+
+// 원작 수정
+export async function updateOriginal(data, image = null) {
+  const formData = new FormData();
+  if (image) formData.append('image', image);
+  const processed = {};
+  Object.keys(data).forEach(key => {
+    const value = data[key];
+    if (typeof value === 'string' || value === '') {
+      processed[key] = toNullIfBlank(value)
+    } else {
+      processed[key] = value
+    }
+  })
+  formData.append('request', JSON.stringify(processed));
+  return Vue.axios.put('/admin/chat/original/update', formData, {
+    headers: { 'Content-Type': 'multipart/form-data' }
+  })
+}
+
+// 원작 삭제
+export async function deleteOriginal(id) {
+  return Vue.axios.delete(`/admin/chat/original/${id}`)
+}
+
+// 원작 상세
+export async function getOriginal(id) {
+  return Vue.axios.get(`/admin/chat/original/${id}`)
+}
+
+// 원작 속 캐릭터 조회
+export async function getOriginalCharacters(id, page = 1, size = 20) {
+  return Vue.axios.get(`/admin/chat/original/${id}/characters`, {
+    params: { page: page - 1, size }
+  })
+}
+
+// 원작에 캐릭터 연결
+export async function assignCharactersToOriginal(id, characterIds = []) {
+  return Vue.axios.post(`/admin/chat/original/${id}/assign-characters`, { characterIds })
+}
+
+// 원작에서 캐릭터 연결 해제
+export async function unassignCharactersFromOriginal(id, characterIds = []) {
+  return Vue.axios.post(`/admin/chat/original/${id}/unassign-characters`, { characterIds })
+}