diff --git a/admin-frontend-vue/src/pages/tasks/duplicate-api.ts b/admin-frontend-vue/src/pages/tasks/duplicate-api.ts
new file mode 100644
index 00000000..340cb51c
--- /dev/null
+++ b/admin-frontend-vue/src/pages/tasks/duplicate-api.ts
@@ -0,0 +1,13 @@
+/** 店铺数据重复检查适配（任务 115-119）：/api/admin/shop-data-crawl/duplicate-check-* 系列端点。 */
+import { http } from '@/api/http'
+import { parseDuplicateOverview, type DuplicateOverview } from './duplicate-model.ts'
+
+export const DUPLICATE_CHECK_ENDPOINT = '/api/admin/shop-data-crawl'
+
+/** 加载撞款总览(可选 force=1 触发同步重扫)。 */
+export async function fetchDuplicateOverview(force = false): Promise<DuplicateOverview> {
+  const { data } = await http.get<unknown>(`${DUPLICATE_CHECK_ENDPOINT}/duplicate-check-overview`, {
+    params: force ? { force: '1' } : undefined,
+  })
+  return parseDuplicateOverview(data)
+}
diff --git a/admin-frontend-vue/src/pages/tasks/duplicate-model.ts b/admin-frontend-vue/src/pages/tasks/duplicate-model.ts
new file mode 100644
index 00000000..3d24d139
--- /dev/null
+++ b/admin-frontend-vue/src/pages/tasks/duplicate-model.ts
@@ -0,0 +1,140 @@
+/** 重复检查模型（任务 115-118）：撞款总览/店铺分布/明细项/详情解析；与 Java shopduplicatecheck snake 契约对齐，纯逻辑。 */
+import { unwrap } from '../../api/envelope.ts'
+
+export interface DuplicateMetrics {
+  shopCount: number
+  asinTotal: number
+  recordTotal: number
+  duplicateAsinTotal: number
+  duplicateShopCount: number
+  siteCount: number
+  asinPerShop: number
+  source: string
+}
+
+export interface DuplicateShop {
+  shopName: string
+  groupName: string
+  countryCodes: string[]
+  asinCount: number
+  recordCount: number
+}
+
+export interface DuplicateOccurrence {
+  asin: string
+  date: string
+  price: string
+  brand: string
+  shopName: string
+  groupName: string
+  countryCodes: string[]
+  country: string
+}
+
+export interface DuplicateItem {
+  asin: string
+  shopCount: number
+  recordCount: number
+  occurrences: DuplicateOccurrence[]
+}
+
+export interface DuplicateOverview {
+  pending: boolean
+  scannedAt: string
+  summary: DuplicateMetrics | null
+  shops: DuplicateShop[]
+}
+
+function text(value: unknown): string {
+  return typeof value === 'string' ? value.trim() : ''
+}
+
+function count(value: unknown): number {
+  return typeof value === 'number' && Number.isFinite(value) ? Math.floor(value) : 0
+}
+
+function double(value: unknown): number {
+  return typeof value === 'number' && Number.isFinite(value) ? value : 0
+}
+
+function strings(value: unknown): string[] {
+  return Array.isArray(value) ? value.map((code) => text(code)).filter(Boolean) : []
+}
+
+/** 解析单店铺分布行。 */
+export function parseDuplicateShop(raw: unknown): DuplicateShop | null {
+  if (!raw || typeof raw !== 'object') return null
+  const r = raw as Record<string, unknown>
+  return {
+    shopName: text(r.shop_name ?? r.shopName),
+    groupName: text(r.group_name ?? r.groupName),
+    countryCodes: strings(r.country_codes ?? r.countryCodes),
+    asinCount: count(r.asin_count ?? r.asinCount),
+    recordCount: count(r.record_count ?? r.recordCount),
+  }
+}
+
+/** 解析单条上架出现。 */
+export function parseDuplicateOccurrence(raw: unknown): DuplicateOccurrence | null {
+  if (!raw || typeof raw !== 'object') return null
+  const r = raw as Record<string, unknown>
+  return {
+    asin: text(r.asin),
+    date: text(r.date),
+    price: text(r.price),
+    brand: text(r.brand),
+    shopName: text(r.shop_name ?? r.shopName),
+    groupName: text(r.group_name ?? r.groupName),
+    countryCodes: strings(r.country_codes ?? r.countryCodes),
+    country: text(r.country),
+  }
+}
+
+/** 解析 ASIN 维度明细项。 */
+export function parseDuplicateItem(raw: unknown): DuplicateItem | null {
+  if (!raw || typeof raw !== 'object') return null
+  const r = raw as Record<string, unknown>
+  const asin = text(r.asin)
+  if (!asin) return null
+  return {
+    asin,
+    shopCount: count(r.shop_count ?? r.shopCount),
+    recordCount: count(r.record_count ?? r.recordCount),
+    occurrences: Array.isArray(r.occurrences)
+      ? r.occurrences.map((occ) => parseDuplicateOccurrence(occ)).filter((occ): occ is DuplicateOccurrence => occ !== null)
+      : [],
+  }
+}
+
+/** 总览负载(data: {pending,scanned_at,summary,shops}) → 类型化；缺省回 pending 空态。 */
+export function parseDuplicateOverview(payload: unknown): DuplicateOverview {
+  const core = unwrap<unknown>(payload)
+  const record = core && typeof core === 'object' ? (core as Record<string, unknown>) : {}
+  const summary = record.summary && typeof record.summary === 'object' && Object.keys(record.summary as Record<string, unknown>).length
+    ? parseDuplicateMetrics(record.summary)
+    : null
+  const shops = Array.isArray(record.shops)
+    ? record.shops.map((raw) => parseDuplicateShop(raw)).filter((shop): shop is DuplicateShop => shop !== null)
+    : []
+  return {
+    pending: record.pending === true || summary === null,
+    scannedAt: text(record.scanned_at ?? record.scannedAt),
+    summary,
+    shops,
+  }
+}
+
+function parseDuplicateMetrics(raw: unknown): DuplicateMetrics | null {
+  if (!raw || typeof raw !== 'object') return null
+  const r = raw as Record<string, unknown>
+  return {
+    shopCount: count(r.shop_count ?? r.shopCount),
+    asinTotal: count(r.asin_total ?? r.asinTotal),
+    recordTotal: count(r.record_total ?? r.recordTotal),
+    duplicateAsinTotal: count(r.duplicate_asin_total ?? r.duplicateAsinTotal),
+    duplicateShopCount: count(r.duplicate_shop_count ?? r.duplicateShopCount),
+    siteCount: count(r.site_count ?? r.siteCount),
+    asinPerShop: double(r.asin_per_shop ?? r.asinPerShop),
+    source: text(r.source),
+  }
+}
diff --git a/admin-frontend-vue/tests/task-115.test.ts b/admin-frontend-vue/tests/task-115.test.ts
new file mode 100644
index 00000000..00261669
--- /dev/null
+++ b/admin-frontend-vue/tests/task-115.test.ts
@@ -0,0 +1,89 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { readSource } from './helpers.ts'
+import { parseDuplicateOverview, parseDuplicateShop } from '../src/pages/tasks/duplicate-model.ts'
+
+test('test_task_115_duplicate_overview_normal_primary_path', () => {
+  // 正常主路径：撞款总览(snake summary + shops)解析为类型化指标。
+  const overview = parseDuplicateOverview({
+    success: true,
+    data: {
+      pending: false,
+      scanned_at: '2026-01-02 10:00:00',
+      summary: {
+        shop_count: 8,
+        asin_total: 1200,
+        record_total: 3400,
+        duplicate_asin_total: 45,
+        duplicate_shop_count: 6,
+        site_count: 5,
+        asin_per_shop: 150,
+        source: 'Excel',
+      },
+      shops: [
+        { shop_name: 'BlueWave', group_name: '华东组', country_codes: ['DE', 'UK'], asin_count: 30, record_count: 90 },
+      ],
+    },
+  })
+  assert.equal(overview.pending, false)
+  assert.equal(overview.summary!.asinTotal, 1200)
+  assert.equal(overview.summary!.duplicateAsinTotal, 45)
+  assert.equal(overview.summary!.duplicateShopCount, 6)
+  assert.equal(overview.summary!.siteCount, 5)
+  assert.equal(overview.shops.length, 1)
+  assert.equal(overview.shops[0].shopName, 'BlueWave')
+  assert.deepEqual(overview.shops[0].countryCodes, ['DE', 'UK'])
+})
+
+test('test_task_115_duplicate_overview_normal_variant_input', () => {
+  // 正常变体：无扫描结果 pending 空态。
+  const overview = parseDuplicateOverview({ data: { pending: true, scanned_at: '', summary: {}, shops: [] } })
+  assert.equal(overview.pending, true)
+  assert.equal(overview.summary, null)
+  assert.deepEqual(overview.shops, [])
+})
+
+test('test_task_115_duplicate_overview_repeated_is_idempotent', () => {
+  // 正常重复：解析稳定、不改输入。
+  const payload = { data: { pending: false, summary: { asin_total: 3 }, shops: [] } }
+  assert.deepEqual(parseDuplicateOverview(payload), parseDuplicateOverview(payload))
+})
+
+test('test_task_115_duplicate_overview_boundary_empty_input', () => {
+  // 边界空值：空负载回默认空态。
+  const overview = parseDuplicateOverview({})
+  assert.equal(overview.pending, true)
+  assert.equal(overview.summary, null)
+  assert.deepEqual(overview.shops, [])
+})
+
+test('test_task_115_duplicate_overview_boundary_single_item', () => {
+  // 边界单元素：单店铺分布解析完整。
+  const shop = parseDuplicateShop({ shop_name: 'S', group_name: 'G', country_codes: ['DE'], asin_count: 1, record_count: 2 })
+  assert.ok(shop)
+  assert.equal(shop.asinCount, 1)
+})
+
+test('test_task_115_duplicate_overview_boundary_limit_or_missing_field', () => {
+  // 边界上限/缺字段：缺省数值回 0；缺国家回空数组。
+  const shop = parseDuplicateShop({ shop_name: 'S' })
+  assert.ok(shop)
+  assert.equal(shop.asinCount, 0)
+  assert.deepEqual(shop.countryCodes, [])
+  assert.equal(shop.groupName, '')
+})
+
+test('test_task_115_duplicate_overview_invalid_input_rejected', () => {
+  // 异常输入：success=false 抛后端 message；非对象店铺行忽略。
+  assert.throws(() => parseDuplicateOverview({ success: false, message: '无权访问重复检查' }), /无权访问/)
+  assert.equal(parseDuplicateShop('garbage'), null)
+})
+
+test('test_task_115_duplicate_overview_dependency_failure_returns_actionable_message', () => {
+  // 依赖失败/加载走 adapter：GET /api/admin/shop-data-crawl/duplicate-check-overview。
+  const api = readSource('src/pages/tasks/duplicate-api.ts')
+  assert.match(api, /\/duplicate-check-overview/)
+  assert.match(api, /fetchDuplicateOverview/)
+  const model = readSource('src/pages/tasks/duplicate-model.ts')
+  assert.equal(/axios|http\./.test(model), false, '总览解析保持纯逻辑')
+})