feat: 完成前端多语言支持和菜单优化

- 缩短菜单标题，解决显示不全问题
- 添加跟随系统语言选项，作为默认选项
- 移除语言切换时的页面刷新，实现无刷新切换
- 完成主要页面的多语言替换：
  * ConfigPage - 全局配置页面
  * ResetPassword - 重置密码页面
  * LeaderList - Leader 列表页面
  * UserList - 用户列表页面
  * Statistics - 统计信息页面
  * OrderList - 订单列表页面
  * TemplateList - 模板列表页面
  * CopyTradingList - 跟单配置列表页面
- 添加简体中文、繁体中文和英文的完整翻译键
- 优化语言设置页面，支持跟随系统语言

frontend/package-lock.json

@@ -12,8 +12,10 @@
         "antd-mobile": "^5.34.0",
         "axios": "^1.6.2",
         "ethers": "^6.9.0",
+        "i18next": "^25.7.1",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
+        "react-i18next": "^16.3.5",
         "react-responsive": "^9.0.2",
         "react-router-dom": "^6.20.0",
         "zustand": "^4.4.7"
@@ -3136,11 +3138,49 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/html-parse-stringify": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/html-parse-stringify/-/html-parse-stringify-3.0.1.tgz",
+      "integrity": "sha512-KknJ50kTInJ7qIScF3jeaFRpMpE8/lfiTdzf/twXyPBLAGrLRTmkz3AdTnKeh40X8k9L2fdYwEp/42WGXIRGcg==",
+      "dependencies": {
+        "void-elements": "3.1.0"
+      }
+    },
     "node_modules/hyphenate-style-name": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/hyphenate-style-name/-/hyphenate-style-name-1.1.0.tgz",
       "integrity": "sha512-WDC/ui2VVRrz3jOVi+XtjqkDjiVjTtFaAGiW37k6b+ohyQ5wYDOGkvCZa8+H0nx3gyvv0+BST9xuOgIyGQ00gw=="
     },
+    "node_modules/i18next": {
+      "version": "25.7.1",
+      "resolved": "https://registry.npmjs.org/i18next/-/i18next-25.7.1.tgz",
+      "integrity": "sha512-XbTnkh1yCZWSAZGnA9xcQfHcYNgZs2cNxm+c6v1Ma9UAUGCeJPplRe1ILia6xnDvXBjk0uXU+Z8FYWhA19SKFw==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://locize.com"
+        },
+        {
+          "type": "individual",
+          "url": "https://locize.com/i18next.html"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.i18next.com/how-to/faq#i18next-is-awesome.-how-can-i-support-the-project"
+        }
+      ],
+      "dependencies": {
+        "@babel/runtime": "^7.28.4"
+      },
+      "peerDependencies": {
+        "typescript": "^5"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/ignore": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",
@@ -4315,6 +4355,32 @@
       "resolved": "https://registry.npmjs.org/react-fast-compare/-/react-fast-compare-3.2.2.tgz",
       "integrity": "sha512-nsO+KSNgo1SbJqJEYRE9ERzo7YtYbou/OqjSQKxV7jcKox7+usiUVZOAC+XnDOABXggQTno0Y1CpVnuWEc1boQ=="
     },
+    "node_modules/react-i18next": {
+      "version": "16.3.5",
+      "resolved": "https://registry.npmjs.org/react-i18next/-/react-i18next-16.3.5.tgz",
+      "integrity": "sha512-F7Kglc+T0aE6W2rO5eCAFBEuWRpNb5IFmXOYEgztjZEuiuSLTe/xBIEG6Q3S0fbl8GXMNo+Q7gF8bpokFNWJww==",
+      "dependencies": {
+        "@babel/runtime": "^7.27.6",
+        "html-parse-stringify": "^3.0.1",
+        "use-sync-external-store": "^1.6.0"
+      },
+      "peerDependencies": {
+        "i18next": ">= 25.6.2",
+        "react": ">= 16.8.0",
+        "typescript": "^5"
+      },
+      "peerDependenciesMeta": {
+        "react-dom": {
+          "optional": true
+        },
+        "react-native": {
+          "optional": true
+        },
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/react-is": {
       "version": "18.3.1",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-18.3.1.tgz",
@@ -4698,7 +4764,7 @@
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
+      "devOptional": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -4818,6 +4884,14 @@
         }
       }
     },
+    "node_modules/void-elements": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/void-elements/-/void-elements-3.1.0.tgz",
+      "integrity": "sha512-Dhxzh5HZuiHQhbvTW9AMetFfBHDMYpo23Uo9btPXgdYP+3T5S+p+jgNy7spra+veYhBP2dCSgxR/i2Y02h5/6w==",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",