Coordinate AI retries and recover shared provider outages

Retry transient requests after one and three minutes and coordinate provider recovery across processes with bounded probe intervals. Preserve completed results when recovery bookkeeping fails, keep concurrent failure accounting accurate, and expose retry state in the UI.

web/tests/ai-availability.test.ts

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+import assert from "node:assert/strict"
+import test from "node:test"
+import * as vue from "vue"
+import { moduleLoader } from "./module-loader.ts"
+
+test("接入状态卸载后丢弃延迟响应", async () => {
+  let unmount = () => {}
+  const pending = Promise.withResolvers<unknown[]>()
+  const load = moduleLoader({
+    "@@/apis/settings": { listProviderAvailabilityApi: () => pending.promise },
+    "@@/composables/useSessionScope": { useSessionScope: () => ({ assertCurrent() {} }) }
+  }, { ...vue, onMounted() {}, onBeforeUnmount(fn: () => void) {
+    unmount = fn
+  } })
+  const page = load("@@/components/AiAvailability/index.vue").default.setup({}, { expose() {} })
+  const request = page.refresh()
+  unmount()
+  pending.resolve([{ provider_id: 1, state: "waiting" }])
+  await request
+  assert.equal(page.states.value.length, 0)
+})
+
+test("接入状态只展示等待和试探，正常接入不显示故障", async () => {
+  let unmount = () => {}
+  const load = moduleLoader({
+    "@@/apis/settings": { listProviderAvailabilityApi: async () => [
+      { provider_id: 1, state: "normal" },
+      { provider_id: 2, state: "waiting", retry_at: "2026-11-06T10:00:00Z" },
+      { provider_id: 3, state: "probing", retry_at: "2026-11-06T10:00:00Z" }
+    ] },
+    "@@/composables/useSessionScope": { useSessionScope: () => ({ assertCurrent() {} }) }
+  }, { ...vue, onMounted() {}, onBeforeUnmount(fn: () => void) {
+    unmount = fn
+  } })
+  const page = load("@@/components/AiAvailability/index.vue").default.setup({}, { expose() {} })
+  try {
+    await page.refresh()
+    assert.equal(page.states.value.length, 2)
+    assert.equal(page.states.value[0].state, "waiting")
+    assert.equal(page.states.value[1].state, "probing")
+    assert.equal(page.failed.value, false)
+  } finally {
+    unmount()
+  }
+})