refactor(i18n): 完成全量硬编码中文文案替换为多语言方案

1.  替换所有页面/组件中的硬编码中文提示文案为$lang调用，包括支付、帮助中心、公告等页面
2.  重构diy.js加载失败文案处理逻辑，支持参数化替换
3.  新增多语言混入逻辑，实现导航标题随语种动态切换
4.  重构支付组件初始化逻辑，优化平台适配代码
5.  添加多语言单元测试和硬编码扫描脚本
6.  更新语言包，新增缺失的翻译词条

lang-bundle.json

@@ -2,7 +2,7 @@
     "code": 0,
     "message": "操作成功",
     "data": {
-        "version": "1784767380",
+        "version": "1784770218",
         "lang": "zh-cn",
         "app_type": "h5",
         "source": "merged",
@@ -464,6 +464,7 @@
             },
             "diy": {
                 "networkErrorTitle": "提示",
+                "networkError": "网络异常，请稍后重试",
                 "retry": "重试",
                 "noDiyData": "未配置自定义页面数据",
                 "locationNotAvailable": "未获取到定位",
@@ -506,7 +507,8 @@
                 "lowVersion": "当前微信基础库版本过低，需要 2.19.2 或以上版本",
                 "notSupported": "当前环境不支持微信视频号",
                 "missingFields": "缺少必要字段: {field}",
-                "playFailed": "微信视频播放失败!"
+                "playFailed": "微信视频播放失败!",
+                "wechatMpOnly": "视频号仅支持在微信小程序环境中播放"
             },
             "uniappUtils": {
                 "errorTip": "错误提示",
@@ -607,6 +609,12 @@
             "addToCartFailMax": "已达到最大购买数量",
             "addToCartFailMin": "已达到最小购买数量",
             "addToCartFailStock": "库存不足",
+            "submitSuccess": "提交成功",
+            "submitFail": "提交失败",
+            "versionInfo": "版本信息",
+            "commitId": "提交 ID",
+            "buildTime": "构建时间",
+            "loading": "加载中...",
             "consult": "立即咨询",
             "consultSuccess": "咨询成功",
             "consultFail": "咨询失败",
@@ -662,7 +670,8 @@
                     "title": "支付方式",
                     "paymentAmount": "支付金额",
                     "confirmPayment": "确认支付",
-                    "seeOrder": "查看订单"
+                    "seeOrder": "查看订单",
+                    "payInfoNotFound": "未获取到支付信息！"
                 },
                 "cashier": {
                     "title": "收银台",
@@ -2403,6 +2412,7 @@
                     "fullGiftItem": "满{limit}{unit}{gift}",
                     "freeShippingItem": "满{limit}{unit}包邮",
                     "productMessage": "商品留言",
+                    "formEmptyTip": "暂无需填写的留言字段",
                     "aiCustomerService": "智能客服",
                     "dialOnMobile": "可在手机端拨打{phone}",
                     "cancel": "取消",
@@ -3469,5 +3479,5 @@
         },
         "sign": ""
     },
-    "timestamp": 1784767380
+    "timestamp": 1784770218
 }