feat(locales): 优化版权信息结构

- 将版权年份分离为单独字段 copyrightYear
- 修改版权字段使用版权年份引用，提高维护性
- 更新中英文版权内容保持一致格式

locales/en.ts

@@ -142,8 +142,9 @@ export default {
     developers: 'Certified Experts',
     aiApps: 'Member Organizations',
     uptime: 'Suggestions',
-    copyrightYear: '© {{ year }}',
-    copyright: '@:login.copyrightYear Guangxi Decision Consulting Center · Professional · Authoritative · Efficient',
+    copyrightSymbol: '©',
+    copyrightYear: ' {{ year }} ',
+    copyright: '@:login.copyrightSymbol@:login.copyrightYear Guangxi Decision Consulting Center · Professional · Authoritative · Efficient',
 
     // Right form
     aiAppPlatform: 'Guangxi Decision Consulting Network',

locales/zh-CN.ts

@@ -142,8 +142,9 @@ export default {
     developers: '认证专家',
     aiApps: '会员单位',
     uptime: '建言献策',
-    copyrightYear: '© {{ year }}',
-    copyright: '@:login.copyrightYear 广西决策咨询中心 · 专业 · 权威 · 高效',
+    copyrightSymbol: '©',
+    copyrightYear: ' {{ year }} ',
+    copyright: '@:login.copyrightSymbol@:login.copyrightYear 广西决策咨询中心 · 专业 · 权威 · 高效',
 
     // 右侧表单
     aiAppPlatform: '广西决策咨询网',