feat: 接入玩家入口与API代理

- 新增 /api 重写代理，支持 LOTTERY_API_PROXY_TARGET 配置
- 玩家首页切换为 EntryGate，并移除 layout 对 PlayerAppShell 的包裹
- 请求层拆分语言头与玩家鉴权注入逻辑，引入 zustand 依赖
- 允许提交 .env.example 供本地配置参考

package-lock.json

@@ -19,7 +19,8 @@
         "react-dom": "19.2.4",
         "sonner": "^2.0.7",
         "tailwind-merge": "^3.5.0",
-        "tw-animate-css": "^1.4.0"
+        "tw-animate-css": "^1.4.0",
+        "zustand": "^5.0.13"
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
@@ -10464,6 +10465,35 @@
       "peerDependencies": {
         "zod": "^3.25.0 || ^4.0.0"
       }
+    },
+    "node_modules/zustand": {
+      "version": "5.0.13",
+      "resolved": "https://registry.npmmirror.com/zustand/-/zustand-5.0.13.tgz",
+      "integrity": "sha512-efI2tVaVQPqtOh114loML/Z80Y4NP3yc+Ff0fYiZJPauNeWZeIp/bRFD7I9bfmCOYBh/PHxlglQ9+wvlwnPikQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.20.0"
+      },
+      "peerDependencies": {
+        "@types/react": ">=18.0.0",
+        "immer": ">=9.0.6",
+        "react": ">=18.0.0",
+        "use-sync-external-store": ">=1.2.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/react": {
+          "optional": true
+        },
+        "immer": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "use-sync-external-store": {
+          "optional": true
+        }
+      }
     }
   }
 }