refactor(i18n): 扁平化国际化语言配置结构

移除多层嵌套的语言对象层级，将翻译项直接挂载到顶层lang对象下，简化语言文件结构，提升维护性

lang/en-us/form/form.js

@@ -1,15 +1,11 @@
 export const lang = {
 
 	// Form page
-	form: {
-		form: {
-			// Page title
-			title: 'Please fill in the form information',
-			// Submit success message
-			submitSuccess: 'Submitted successfully',
-			// Form information not available
-			noFormInfo: 'Form information not available',
-		},
-	},
+	// Page title
+	title: 'Please fill in the form information',
+	// Submit success message
+	submitSuccess: 'Submitted successfully',
+	// Form information not available
+	noFormInfo: 'Form information not available',
 
 }

lang/en-us/form/formdata.js

@@ -1,18 +1,13 @@
 export const lang = {
 
 	// Form page - formdata
-	form: {
-		formdata: {
-			title: 'Form Details',
-			// Empty state messages
-			submitSuccess: 'Submitted successfully',
-			noFormInfo: 'Form information not available',
-			// Form tip placeholder
-			formTipPlaceholder: 'Please fill in the required form information',
-			// Modal dialog
-			tip: 'Tip',
-			paramError: 'Parameter error',
-		}
-	}
-
+	title: 'Form Details',
+	// Empty state messages
+	submitSuccess: 'Submitted successfully',
+	noFormInfo: 'Form information not available',
+	// Form tip placeholder
+	formTipPlaceholder: 'Please fill in the required form information',
+	// Modal dialog
+	tip: 'Tip',
+	paramError: 'Parameter error',
 }