feat(diy): add in-page error prompt for diy data loading failure

1. add multi-language error copy for api request and network exceptions
2. add fixed top error banner component for index page
3. rewrite diy data request error handling: replace toast with reliable in-page prompt with retry button
4. add detailed error reason and request url display in error prompt

lang/en-us/common.js

@@ -61,6 +61,14 @@ export const lang = {
 		retry: 'Retry',
 		noDiyData: 'Custom page data not configured',
 		locationNotAvailable: 'Location not available',
+		// detailed data-load failure messages
+		loadFailTpl: 'Failed to load page data: {reason}, please try again later',
+		errNotFound: 'API not found',
+		errServer: 'Server error',
+		errAuth: 'No access permission',
+		errRequest: 'Request failed',
+		errTimeout: 'Request timeout',
+		errNetwork: 'Network connection failed',
 	},
 
 	//customer service
@@ -142,6 +150,8 @@ export const lang = {
 		serverError: 'Service temporarily unavailable, please try again later',
 		// request aborted
 		aborted: 'Request cancelled',
+		// unknown error (errorType fallback, e.g. non-5xx HTTP status like 404)
+		unknown: 'Request failed, please try again later',
 		// unknown error
 		unknownError: 'Request failed, please try again later',
 	},

lang/zh-cn/common.js

@@ -68,6 +68,14 @@ export const lang = {
 		retry: '重试',
 		noDiyData: '未配置自定义页面数据',
 		locationNotAvailable: '未获取到定位',
+		// 数据加载失败详细文案
+		loadFailTpl: '页面数据加载失败：{reason}，请稍后重试',
+		errNotFound: '接口不存在',
+		errServer: '服务器异常',
+		errAuth: '无访问权限',
+		errRequest: '请求失败',
+		errTimeout: '请求超时',
+		errNetwork: '网络连接失败',
 	},
 
 	// 客服服务
@@ -142,6 +150,8 @@ export const lang = {
 		serverError: '服务暂时不可用，请稍后重试',
 		// 请求被中断
 		aborted: '请求已取消',
+		// 未知错误(errorType 分类兜底,如非 5xx 的 HTTP 状态码 404 等)
+		unknown: '请求失败，请稍后重试',
 		// 未知错误
 		unknownError: '请求失败，请稍后重试',
 	},