Add official DOL and EIA economic calendar feeds

Collect weekly claims and precise commercial petroleum inventory changes with official schedule exceptions, distinct reporting periods, raw evidence, and revisions.

Extend explicit history backfills without changing their default source scope. Report archive gaps and reject mismatched weeks instead of filling current values into history.

web/src/pages/calendar/index.vue

@@ -23,7 +23,7 @@ const country = ref("")
 const impactLabels = { pending: "待公布", bullish: "利多", bearish: "利空", neutral: "影响较小", uncertain: "待判断" }
 const countries = computed(() => data.value?.countries ?? [])
 const labels = { scheduled: "待公布", waiting: "获取中", delayed: "取数延迟", released: "已公布", withdrawn: "已撤回", error: "采集异常", historical: "仅有日程", unavailable: "官方未公布" }
-const sources: Record<string, string> = { bls: "BLS", bea: "BEA", fed: "美联储", umich: "密歇根大学", ecb: "欧洲央行", eurostat: "Eurostat", boe: "英国央行", ons: "ONS", destatis: "Destatis", insee: "INSEE" }
+const sources: Record<string, string> = { bls: "BLS", bea: "BEA", fed: "美联储", umich: "密歇根大学", ecb: "欧洲央行", eurostat: "Eurostat", boe: "英国央行", ons: "ONS", destatis: "Destatis", insee: "INSEE", dol: "美国劳工部 DOL", eia: "美国能源信息署 EIA" }
 const formatted = (time: string) => dayjs(time).tz(zone).format("MM-DD HH:mm:ss")
 const value = (v: string | null, unit: string) => v === null ? "—" : `${v}${unit}`
 const groups = computed(() => {