refactor(frontend): split large reimbursement and audit modules

web/src/composables/useBackendHealth.js

@@ -6,6 +6,12 @@ const backendHealthy = ref(true)
 const backendChecking = ref(false)
 const backendError = ref('')
 let lastCheckedAt = 0
+const DEFAULT_HEALTH_TIMEOUT_MS = 2500
+const REQUEST_TIMEOUT_CODE = 'REQUEST_TIMEOUT'
+
+function isRequestTimeout(error) {
+  return error?.code === REQUEST_TIMEOUT_CODE
+}
 
 export async function checkBackendHealth(options = {}) {
   const force = Boolean(options.force)
@@ -18,7 +24,9 @@ export async function checkBackendHealth(options = {}) {
   backendChecking.value = true
 
   try {
-    const payload = await fetchBackendHealth()
+    const payload = await fetchBackendHealth({
+      timeoutMs: Number(options.timeoutMs || DEFAULT_HEALTH_TIMEOUT_MS)
+    })
     const ok = payload?.status === 'ok'
 
     backendHealthy.value = ok
@@ -28,6 +36,12 @@ export async function checkBackendHealth(options = {}) {
     lastCheckedAt = now
     return ok
   } catch (error) {
+    if (isRequestTimeout(error) && options.allowStaleOnTimeout) {
+      backendError.value = error?.message || '后端正在处理耗时任务，已先展示页面。'
+      lastCheckedAt = now
+      return backendHealthy.value !== false
+    }
+
     backendHealthy.value = false
     backendError.value = error?.message || '无法连接后端服务。'
     lastCheckedAt = now