feat(player, i18n): add error code mappings and back to main site button

1. 新增8001-8005业务错误码的国际化翻译与映射
2. 增加返回主站按钮，根据环境变量显示
3. 重构错误码匹配逻辑，复用常量对象

src/features/player/entry-gate.tsx

@@ -17,7 +17,7 @@ import { useTranslation } from "react-i18next";
 
 import { getPlayerMe, getPlayerPing } from "@/api/player";
 import { LanguageSwitcher } from "@/components/language-switcher";
-import { Button } from "@/components/ui/button";
+import { Button, buttonVariants } from "@/components/ui/button";
 import { cn } from "@/lib/utils";
 import { usePlayerSessionStore } from "@/stores/player-session-store";
 import { LotteryApiBizError } from "@/types/api/errors";
@@ -25,6 +25,17 @@ import { LotteryApiBizError } from "@/types/api/errors";
 const RETRY_ATTEMPTS = 3;
 const RETRY_DELAY_MS = 2000;
 
+const MAIN_SITE_URL = process.env.NEXT_PUBLIC_MAIN_SITE_URL?.trim() ?? "";
+
+/** `/api/player/me` 等业务信封业务码 — 玩家 SSO 段 8001–8005（与后端 ErrorCode 一致） */
+const PLAYER_BIZ_DETAIL: Partial<Record<number, string>> = {
+  8001: "errors.player8001",
+  8002: "errors.player8002",
+  8003: "errors.player8003",
+  8004: "errors.player8004",
+  8005: "errors.player8005",
+};
+
 type EntryStepId = "token" | "account" | "hall";
 
 type EntryStepStatus = "pending" | "in-progress" | "done" | "error";
@@ -160,12 +171,7 @@ export function EntryGate() {
 
           const details: FailureRow[] = [];
           if (typeof err.code === "number") {
-            const keyByCode: Partial<Record<number, string>> = {
-              401: "errors.http401",
-              403: "errors.http403",
-              404: "errors.http404",
-            };
-            const dk = keyByCode[err.code];
+            const dk = PLAYER_BIZ_DETAIL[err.code];
             details.push({
               code: String(err.code),
               ...(dk ? { detailKey: dk } : {}),
@@ -373,15 +379,27 @@ export function EntryGate() {
               </div>
             ) : null}
 
-            <Button
-              onClick={handleRetry}
-              className="w-full gap-2 bg-red-600 text-white hover:bg-red-700"
-              size="lg"
-              type="button"
-            >
-              <Loader2 className="size-4" aria-hidden />
-              {t("failure.reenter")}
-            </Button>
+            <div className="flex flex-col gap-2">
+              <Button
+                onClick={handleRetry}
+                className="w-full gap-2 bg-red-600 text-white hover:bg-red-700"
+                size="lg"
+                type="button"
+              >
+                <Loader2 className="size-4" aria-hidden />
+                {t("failure.reenter")}
+              </Button>
+              {MAIN_SITE_URL !== "" ? (
+                <a
+                  href={MAIN_SITE_URL}
+                  target="_top"
+                  rel="noopener noreferrer"
+                  className={cn(buttonVariants({ variant: "outline", size: "lg" }), "w-full")}
+                >
+                  {t("failure.backToMainSite")}
+                </a>
+              ) : null}
+            </div>
           </div>
         ) : null}