feat(worker): IO Worker 分道(WK-1)

io worker 进程内按任务声明的 lane 分文件 / 网络 / 维护三条道,各自并发(缺省 2/4/1)、
各自排队;维护道在文件道或网络道有排队/运行时让路(连续 10 分钟放行一个),调度器内联的
清理/回填/保留期裁剪也走维护道。并发在 设置 → 自动化 → 高级 热生效,env 覆盖;旧
WORKER_CONCURRENCY 映射到网络道。运行状态页按道显示运行中/并发/排队。归属表写进
docs/runbook/dev.md,ci 与注册表逐项核对。

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/settings/automation.tsx

@@ -10,7 +10,7 @@ import { type FormValues, num } from "./resource-section.tsx";
 import { anchorId, SettingsBlock } from "./settings-block.tsx";
 import { type CardSpec, n, SettingsCard, SettingsGate } from "./settings-card.tsx";
 
-// 自动化分区:总开关、只读对账、缓存水位、每日下载预算、保留天数、存储预算与保留(CACHE-2)
+// 自动化分区:总开关、只读对账、缓存水位、每日下载预算、保留天数、后台任务并发(WK-1)、存储预算与保留(CACHE-2)
 
 const GiB = 1024 ** 3;
 
@@ -106,6 +106,33 @@ const dayField = (group: "retentionDays" | "cacheTtl", k: string, label: string,
 const pick = (v: FormValues, prefix: string, keys: readonly string[]) =>
   Object.fromEntries(keys.map((k) => [k, num(v[`${prefix}.${k}`])]));
 
+// WK-1:io worker 三条道的并发(settings.automation.workerLanes,docs/runbook/dev.md「IO Worker 分道」)
+const LANE_KEYS = ["file", "network", "maintenance"] as const;
+const WORKER_LANES_CARD: CardSpec = {
+  anchor: "worker-lanes",
+  title: "后台任务并发",
+  description:
+    "后台任务分三条道各自排队，互不占用。保存后几秒内生效，不用重启；服务器上设置了对应的环境变量时以环境变量为准。",
+  fields: [
+    { name: "automation.workerLanes.file", label: "文件道", kind: "number", hint: "整理、硬链接、移动、校验；1–16" },
+    {
+      name: "automation.workerLanes.network",
+      label: "网络道",
+      kind: "number",
+      hint: "站点、RSS、TMDB、下载器、搜索；单站限流另计；1–16",
+    },
+    {
+      name: "automation.workerLanes.maintenance",
+      label: "维护道",
+      kind: "number",
+      hint: "清理、回填、对账；前两道有活时让路；1–16",
+    },
+  ],
+  fromSettings: (s) =>
+    Object.fromEntries(LANE_KEYS.map((k) => [`automation.workerLanes.${k}`, n(s.automation.workerLanes[k])])),
+  toPatch: (v) => ({ automation: { workerLanes: pick(v, "automation.workerLanes", LANE_KEYS) } }),
+};
+
 const BUDGET_KEYS = ["pgDataGb", "pgDataWarnGb", "imagesGb", "backupsGb", "sessionsEvidenceGb"] as const;
 const STORAGE_BUDGET_CARD: CardSpec = {
   anchor: "storage",
@@ -212,7 +239,7 @@ function ToggleRow({
   );
 }
 
-/** 高级:只读对账、存储预算、流水保留、缓存有效期;默认收起,从 #automation/advanced 进来时展开 */
+/** 高级:只读对账、后台任务并发、存储预算、流水保留、缓存有效期;默认收起,从 #automation/advanced 进来时展开 */
 function Advanced({ children }: { children: ReactNode }) {
   const location = useLocation();
   const [open, setOpen] = useState(() => location.hash.endsWith("/advanced"));
@@ -232,7 +259,9 @@ function Advanced({ children }: { children: ReactNode }) {
           className={cn("size-4 text-muted-foreground transition-transform duration-base", open && "rotate-180")}
         />
       </button>
-      <p className="mt-1 text-caption text-muted-foreground">只读对账、存储预算、数据保留和缓存有效期。一般不用改。</p>
+      <p className="mt-1 text-caption text-muted-foreground">
+        只读对账、后台任务并发、存储预算、数据保留和缓存有效期。一般不用改。
+      </p>
       {open ? <div className="mt-6 grid grid-cols-1 gap-8">{children}</div> : null}
     </section>
   );
@@ -309,6 +338,7 @@ export function AutomationSection() {
             <SettingsCard section="automation" spec={RETENTION_CARD} settings={s} />
             <Advanced>
               <ReadOnlySwitch />
+              <SettingsCard section="automation" spec={WORKER_LANES_CARD} settings={s} />
               <SettingsCard section="automation" spec={STORAGE_BUDGET_CARD} settings={s} />
               <SettingsCard section="automation" spec={STORAGE_RETENTION_CARD} settings={s} />
               <SettingsCard section="automation" spec={STORAGE_TTL_CARD} settings={s} />