feat: 发布三笙AI情报局独立版公司研发基线

同步家纺情报 v2 数据、59 个严格权威源、趋势图库、移动端交互、Google/Yandex 翻译门控及静态 SEO/GEO 构建。补充面向 C# 研发的 README，明确当前无 LLM、多模态与生图模型，记录翻译请求参数、缓存与失败策略、数据处理边界、前端职责和无 GitHub Pages 部署流程。新增按日期倒序维护的 CHANGELOG，记录影响、验证与代码/数据/dist 回滚方法。验证：11 个 Python 契约测试、13 个 Node 前端测试通过；静态构建生成 1096 个 Sitemap URL。
2026-08-14 19:26:39 +08:00
commit f1ce583fd1
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+let visitorCountryPromise = null;
+const IP_LOOKUP_TIMEOUT_MS = 3500;
+
+async function fetchWithTimeout(url, options = {}) {
+  const controller = new AbortController();
+  const timeout = window.setTimeout(() => controller.abort(), IP_LOOKUP_TIMEOUT_MS);
+  try {
+    return await fetch(url, { ...options, signal: controller.signal });
+  } finally {
+    window.clearTimeout(timeout);
+  }
+}
+
+async function countryFromCloudflare() {
+  for (const url of ["/cdn-cgi/trace", "https://www.cloudflare.com/cdn-cgi/trace"]) {
+    try {
+      const response = await fetchWithTimeout(url, { credentials: "omit", headers: { Accept: "text/plain" }, mode: "cors" });
+      if (!response.ok) continue;
+      const country = String((await response.text()).match(/^loc=([A-Z]{2})$/m)?.[1] || "").toUpperCase();
+      if (country) return country;
+    } catch {}
+  }
+  return "";
+}
+
+async function countryFromCountryIs() {
+  const response = await fetchWithTimeout("https://api.country.is/", { credentials: "omit", mode: "cors" });
+  if (!response.ok) return "";
+  return String((await response.json())?.country || "").toUpperCase();
+}
+
+async function countryFromIpWho() {
+  const response = await fetchWithTimeout("https://ipwho.is/?fields=success,country_code", {
+    credentials: "omit",
+    headers: { Accept: "application/json" },
+    mode: "cors",
+  });
+  if (!response.ok) return "";
+  const payload = await response.json();
+  return payload?.success ? String(payload.country_code || "").toUpperCase() : "";
+}
+
+export function detectVisitorCountry() {
+  if (visitorCountryPromise) return visitorCountryPromise;
+  if (typeof window === "undefined" || typeof fetch !== "function") return Promise.resolve("");
+  visitorCountryPromise = (async () => {
+    for (const detector of [countryFromCloudflare, countryFromCountryIs, countryFromIpWho]) {
+      try {
+        const country = await detector();
+        if (/^[A-Z]{2}$/.test(country)) return country;
+      } catch (error) {
+        console.debug("[家纺跨境情报] IP 区域检测源不可用，继续尝试备用源:", error);
+      }
+    }
+    return "UNKNOWN";
+  })();
+  return visitorCountryPromise;
+}
+
+export function visitorCanUseGoogleFallback() {
+  if (typeof navigator === "undefined" || typeof Intl === "undefined") return false;
+  const language = String(navigator.languages?.[0] || navigator.language || "").toLowerCase();
+  const timeZone = String(Intl.DateTimeFormat().resolvedOptions().timeZone || "");
+  const nonChineseLanguage = Boolean(language) && !language.startsWith("zh");
+  const outsideChinaTimeZone = Boolean(timeZone) && !["Asia/Shanghai", "Asia/Urumqi"].includes(timeZone);
+  return nonChineseLanguage || outsideChinaTimeZone;
+}
+
+export function translationProvider(countryCode, googleFallback = visitorCanUseGoogleFallback()) {
+  if (countryCode === "CN") return "yandex";
+  if (countryCode && countryCode !== "UNKNOWN") return "google";
+  if ((!countryCode || countryCode === "UNKNOWN") && googleFallback) return "google";
+  return "yandex";
+}