diff --git a/frontend-vue/src/shared/api/java-modules.ts b/frontend-vue/src/shared/api/java-modules.ts
index 68f3b767..29cdfe84 100644
--- a/frontend-vue/src/shared/api/java-modules.ts
+++ b/frontend-vue/src/shared/api/java-modules.ts
@@ -8,19 +8,20 @@
   unwrapJavaResponse,
 } from "@/shared/api/http";
 import { getTaskProgressCacheTtlMs } from "@/shared/task-progress-config";
+import { createTaskProgressRequestCache } from "@/shared/task-progress-request-cache";
 
 const JAVA_API_PREFIX = "/newApi/api";
-type TaskProgressCacheEntry = {
-  expiresAt: number;
-  data: unknown;
-};
 
 interface TaskProgressBatchOptions {
   force?: boolean;
 }
 
-const taskProgressResponseCache = new Map<string, TaskProgressCacheEntry>();
-const taskProgressInflightRequests = new Map<string, Promise<unknown>>();
+/** 进度批量接口的响应缓存与并发合并：TTL 过期、有界条目、in-flight 去重 */
+const taskProgressResponseCache = createTaskProgressRequestCache<unknown>({
+  ttlMs: () => getTaskProgressCacheTtlMs(),
+  maxEntries: 100,
+  maxInflight: 16,
+});
 
 function getCurrentUserId() {
   const raw =
@@ -59,13 +60,12 @@ async function postTaskProgressBatch<T>(
   }
 
   const cacheKey = buildTaskProgressRequestKey(path, normalizedTaskIds);
-  const now = Date.now();
   const cached = taskProgressResponseCache.get(cacheKey);
-  if (!options.force && cached && cached.expiresAt > now) {
-    return cached.data as T;
+  if (!options.force && cached !== undefined) {
+    return cached as T;
   }
 
-  const inflight = taskProgressInflightRequests.get(cacheKey);
+  const inflight = taskProgressResponseCache.getInflight(cacheKey);
   if (!options.force && inflight) {
     return (await inflight) as T;
   }
@@ -74,17 +74,14 @@ async function postTaskProgressBatch<T>(
     post<JavaApiResponse<T>, { taskIds: number[] }>(path, { taskIds: normalizedTaskIds }),
   )
     .then((data) => {
-      taskProgressResponseCache.set(cacheKey, {
-        data,
-        expiresAt: Date.now() + getTaskProgressCacheTtlMs(),
-      });
+      taskProgressResponseCache.set(cacheKey, data);
       return data;
     })
     .finally(() => {
-      taskProgressInflightRequests.delete(cacheKey);
+      taskProgressResponseCache.endInflight(cacheKey);
     });
 
-  taskProgressInflightRequests.set(cacheKey, requestPromise);
+  taskProgressResponseCache.startInflight(cacheKey, requestPromise);
   return requestPromise;
 }
 
diff --git a/frontend-vue/src/shared/task-progress-request-cache.ts b/frontend-vue/src/shared/task-progress-request-cache.ts
new file mode 100644
index 00000000..af483ad6
--- /dev/null
+++ b/frontend-vue/src/shared/task-progress-request-cache.ts
@@ -0,0 +1,167 @@
+/**
+ * 进度请求响应缓存与并发合并（Task 90）。
+ *
+ * 为进度接口提供断网、超时、服务恢复与重复响应场景的确定行为：
+ * - set/get：按 key 缓存最近一次成功响应，TTL 过期后惰性清除并计 miss；
+ * - startInflight/getInflight/endInflight：同一 key 的并发请求只发起一次，
+ *   后续调用方合并到同一 Promise（重复登记返回 false，不覆盖原 Promise）；
+ * - clear：断网恢复后清空缓存与 in-flight，重新可用；
+ * - 请求失败（断网/超时）只释放 in-flight 槽位，不清除未过期的旧缓存，
+ *   服务恢复后旧缓存仍可降级命中。
+ *
+ * 有界内存：maxEntries 超限驱逐最旧条目；maxInflight 超限拒绝合并
+ * （请求照常发出，只是不合并）；空 key 写入与登记 fail-fast 抛错。
+ * 纯 TS 模块，无副作用；now 可注入用于测试时钟推进。
+ */
+export interface TaskProgressRequestCacheOptions {
+  /**
+   * 缓存有效期（毫秒），必须为正数；也可传函数在每次 set 时动态取值
+   * （如按页面可见性切换 TTL），函数返回值同样必须为正数
+   */
+  ttlMs: number | (() => number)
+  /** 缓存条目上限，超过时驱逐最旧条目；必须为正数 */
+  maxEntries?: number
+  /** 同时合并的 in-flight 请求数上限，超过时拒绝登记；必须为正数 */
+  maxInflight?: number
+  /** 时钟注入，默认 Date.now */
+  now?: () => number
+}
+
+export interface TaskProgressRequestCacheStats {
+  cacheEntries: number
+  inflightCount: number
+  hitCount: number
+  missCount: number
+  evictedCount: number
+  rejectedCount: number
+}
+
+export interface TaskProgressRequestCache<T> {
+  get: (key: string) => T | undefined
+  set: (key: string, data: T) => void
+  clear: () => void
+  startInflight: (key: string, promise: Promise<T>) => boolean
+  getInflight: (key: string) => Promise<T> | undefined
+  endInflight: (key: string) => void
+  stats: () => TaskProgressRequestCacheStats
+}
+
+export function createTaskProgressRequestCache<T>(options: TaskProgressRequestCacheOptions) {
+  const ttl = options.ttlMs
+  const ttlValue = typeof ttl === 'number' ? ttl : 0
+  if (typeof ttl === 'number') {
+    if (!(ttl > 0)) {
+      throw new Error('ttlMs 必须为正数: ' + ttl)
+    }
+  } else if (typeof ttl === 'function') {
+    if (!(ttl() > 0)) {
+      throw new Error('ttlMs 必须为正数: ' + ttl())
+    }
+  } else {
+    throw new Error('ttlMs 必须为正数: ' + String(ttl))
+  }
+  const maxEntries = options.maxEntries ?? 100
+  const maxInflight = options.maxInflight ?? 16
+  if (!(maxEntries > 0)) {
+    throw new Error('maxEntries 必须为正数: ' + maxEntries)
+  }
+  if (!(maxInflight > 0)) {
+    throw new Error('maxInflight 必须为正数: ' + maxInflight)
+  }
+  const now = options.now ?? Date.now
+
+  interface CacheEntry {
+    data: T
+    expiresAt: number
+    createdAt: number
+  }
+  const entries = new Map<string, CacheEntry>()
+  const inflight = new Map<string, Promise<T>>()
+  let hitCount = 0
+  let missCount = 0
+  let evictedCount = 0
+  let rejectedCount = 0
+
+  function requireKey(key: string) {
+    if (typeof key !== 'string' || key.length === 0) {
+      throw new Error('key 必须是非空字符串: ' + String(key))
+    }
+  }
+
+  function get(key: string): T | undefined {
+    if (typeof key !== 'string' || key.length === 0) {
+      return undefined
+    }
+    const entry = entries.get(key)
+    if (!entry) {
+      missCount += 1
+      return undefined
+    }
+    if (entry.expiresAt <= now()) {
+      entries.delete(key)
+      missCount += 1
+      return undefined
+    }
+    hitCount += 1
+    return entry.data
+  }
+
+  function set(key: string, data: T) {
+    requireKey(key)
+    const current = now()
+    const ttlMs = typeof ttl === 'number' ? ttl : ttl()
+    if (!(ttlMs > 0)) {
+      throw new Error('ttlMs 必须为正数: ' + ttlMs)
+    }
+    entries.set(key, { data, expiresAt: current + ttlMs, createdAt: current })
+    while (entries.size > maxEntries) {
+      const oldestKey = entries.keys().next().value as string
+      entries.delete(oldestKey)
+      evictedCount += 1
+    }
+  }
+
+  function clear() {
+    entries.clear()
+    inflight.clear()
+  }
+
+  function startInflight(key: string, promise: Promise<T>): boolean {
+    requireKey(key)
+    if (inflight.has(key)) {
+      rejectedCount += 1
+      return false
+    }
+    if (inflight.size >= maxInflight) {
+      rejectedCount += 1
+      return false
+    }
+    inflight.set(key, promise)
+    return true
+  }
+
+  function getInflight(key: string): Promise<T> | undefined {
+    if (typeof key !== 'string' || key.length === 0) return undefined
+    return inflight.get(key)
+  }
+
+  function endInflight(key: string) {
+    if (typeof key !== 'string' || key.length === 0) return
+    inflight.delete(key)
+  }
+
+  function stats(): TaskProgressRequestCacheStats {
+    return {
+      cacheEntries: entries.size,
+      inflightCount: inflight.size,
+      hitCount,
+      missCount,
+      evictedCount,
+      rejectedCount,
+    }
+  }
+
+  return { get, set, clear, startInflight, getInflight, endInflight, stats }
+}
+
+export type TaskProgressRequestCacheHandle = ReturnType<typeof createTaskProgressRequestCache>
diff --git a/frontend-vue/tests/task-progress-request-cache.test.ts b/frontend-vue/tests/task-progress-request-cache.test.ts
new file mode 100644
index 00000000..ee97aa41
--- /dev/null
+++ b/frontend-vue/tests/task-progress-request-cache.test.ts
@@ -0,0 +1,134 @@
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import { createTaskProgressRequestCache } from '../src/shared/task-progress-request-cache.ts'
+
+const detail = (n: number) => ({ items: [{ taskId: n, status: 'SUCCESS' }] })
+
+test('test_task_090_progress_resilience_normal_default_path', () => {
+  let now = 1000
+  const cache = createTaskProgressRequestCache({ ttlMs: 5000, now: () => now })
+  assert.equal(cache.get('a'), undefined)
+  cache.set('a', detail(1))
+  assert.deepEqual(cache.get('a'), detail(1))
+  const stats = cache.stats()
+  assert.equal(stats.cacheEntries, 1)
+  assert.equal(stats.hitCount, 1)
+  assert.equal(stats.missCount, 1)
+  // in-flight 合并：先查后登记，同 key 并发只保留一个
+  const p = Promise.resolve(detail(2))
+  assert.equal(cache.getInflight('b'), undefined)
+  assert.equal(cache.startInflight('b', p), true)
+  assert.equal(cache.getInflight('b'), p)
+  assert.equal(cache.startInflight('b', Promise.resolve(detail(3))), false, '同 key 已合并，拒绝重复登记')
+  cache.endInflight('b')
+  assert.equal(cache.getInflight('b'), undefined)
+})
+
+test('test_task_090_progress_resilience_normal_multiple_items', () => {
+  const cache = createTaskProgressRequestCache({ ttlMs: 10_000 })
+  for (let i = 1; i <= 4; i++) cache.set(`k${i}`, detail(i))
+  assert.deepEqual(cache.get('k1'), detail(1))
+  assert.deepEqual(cache.get('k4'), detail(4))
+  assert.equal(cache.stats().cacheEntries, 4)
+  // 各 key 互不串扰；顺序稳定
+  assert.deepEqual(cache.get('k2'), detail(2))
+  assert.deepEqual(cache.get('k3'), detail(3))
+})
+
+test('test_task_090_progress_resilience_normal_repeated_operation_is_idempotent', () => {
+  const cache = createTaskProgressRequestCache({ ttlMs: 5000 })
+  cache.set('a', detail(1))
+  cache.set('a', detail(1))
+  assert.equal(cache.stats().cacheEntries, 1, '重复 set 覆盖不新增条目')
+  assert.deepEqual(cache.get('a'), detail(1))
+  // endInflight 幂等
+  const p = Promise.resolve(detail(2))
+  cache.startInflight('b', p)
+  cache.endInflight('b')
+  cache.endInflight('b')
+  assert.equal(cache.getInflight('b'), undefined)
+  // startInflight 重复登记返回 false 且不覆盖原 promise
+  cache.startInflight('c', p)
+  assert.equal(cache.startInflight('c', Promise.resolve(detail(9))), false)
+  assert.equal(cache.getInflight('c'), p)
+})
+
+test('test_task_090_progress_resilience_boundary_empty_input', () => {
+  const cache = createTaskProgressRequestCache({ ttlMs: 5000 })
+  assert.equal(cache.get(''), undefined, '空 key 读取宽容')
+  assert.equal(cache.get('missing'), undefined)
+  assert.equal(cache.getInflight(''), undefined)
+  cache.endInflight('') // 宽容无操作
+  cache.clear()
+  assert.equal(cache.stats().cacheEntries, 0)
+  assert.equal(cache.stats().inflightCount, 0)
+  // clear 后继续可正常读写（服务恢复后可重新使用）
+  cache.set('a', detail(1))
+  assert.deepEqual(cache.get('a'), detail(1))
+})
+
+test('test_task_090_progress_resilience_boundary_single_item', () => {
+  const cache = createTaskProgressRequestCache({ ttlMs: 5000 })
+  cache.set('single', detail(7))
+  assert.deepEqual(cache.get('single'), detail(7))
+  assert.equal(cache.stats().cacheEntries, 1)
+  assert.equal(cache.stats().missCount, 0)
+  // 单并发请求合并
+  const p = Promise.resolve(detail(8))
+  assert.equal(cache.startInflight('single', p), true)
+  assert.equal(cache.getInflight('single'), p)
+})
+
+test('test_task_090_progress_resilience_boundary_limit_and_overflow', () => {
+  let now = 0
+  const cache = createTaskProgressRequestCache({ ttlMs: 5000, maxEntries: 3, maxInflight: 2, now: () => now })
+  for (let i = 1; i <= 5; i++) cache.set(`k${i}`, detail(i))
+  assert.equal(cache.stats().cacheEntries, 3, '超过 maxEntries 只保留最近 3 条')
+  assert.equal(cache.stats().evictedCount, 2)
+  assert.equal(cache.get('k1'), undefined, '最旧条目被驱逐')
+  assert.equal(cache.get('k2'), undefined)
+  assert.deepEqual(cache.get('k5'), detail(5))
+  // TTL 过期：惰性清除并计 miss
+  now = 10_000
+  assert.equal(cache.get('k5'), undefined)
+  assert.equal(cache.stats().cacheEntries, 2)
+  // in-flight 超上限拒绝合并，但不丢请求
+  const p = Promise.resolve(detail(9))
+  assert.equal(cache.startInflight('a', p), true)
+  assert.equal(cache.startInflight('b', p), true)
+  assert.equal(cache.startInflight('c', p), false, '超过 maxInflight 拒绝合并')
+  assert.equal(cache.stats().rejectedCount, 1)
+  assert.equal(cache.getInflight('c'), undefined)
+})
+
+test('test_task_090_progress_resilience_invalid_input_rejected', () => {
+  assert.throws(() => createTaskProgressRequestCache({ ttlMs: 0 }), /ttlMs 必须为正数/)
+  assert.throws(() => createTaskProgressRequestCache({ ttlMs: -1 }), /ttlMs 必须为正数/)
+  assert.throws(() => createTaskProgressRequestCache({ ttlMs: 'x' as never }), /ttlMs 必须为正数/)
+  assert.throws(() => createTaskProgressRequestCache({ ttlMs: 100, maxEntries: 0 }), /maxEntries 必须为正数/)
+  assert.throws(() => createTaskProgressRequestCache({ ttlMs: 100, maxInflight: 0 }), /maxInflight 必须为正数/)
+  const cache = createTaskProgressRequestCache({ ttlMs: 100 })
+  assert.throws(() => cache.set('', detail(1)), /key 必须是非空字符串/)
+  assert.throws(() => cache.set(null as never, detail(1)), /key 必须是非空字符串/)
+  assert.throws(() => cache.startInflight('', Promise.resolve(detail(1))), /key 必须是非空字符串/)
+})
+
+test('test_task_090_progress_resilience_dependency_failure_releases_resources', () => {
+  const cache = createTaskProgressRequestCache({ ttlMs: 5000 })
+  // 断网/超时：请求 reject → in-flight 必须释放，缓存不被污染
+  const failed = Promise.reject(new Error('Network Error'))
+  const promise = failed.catch(() => undefined) // 吞掉 unhandled rejection
+  cache.startInflight('a', promise)
+  assert.equal(cache.stats().inflightCount, 1)
+  cache.endInflight('a')
+  assert.equal(cache.stats().inflightCount, 0, '失败后 in-flight 槽位释放')
+  assert.equal(cache.get('a'), undefined, '失败响应不进入缓存')
+  // 服务恢复：重试成功 → 缓存重新填充并可命中
+  cache.set('a', detail(1))
+  assert.deepEqual(cache.get('a'), detail(1))
+  // 断网时旧缓存兜底：请求失败不删除未过期旧条目
+  const p2 = failed.catch(() => undefined)
+  cache.startInflight('a', p2)
+  cache.endInflight('a')
+  assert.deepEqual(cache.get('a'), detail(1), '失败不清除旧缓存，恢复后可降级命中')
+})