refactor: 将Data到ViewModel的转换由App转移至Server端

- 将逻辑转移到Server端后，简化前端逻辑

server/api/cms/solution/[id].get.ts

@@ -0,0 +1,14 @@
+import { solutionService } from '~~/server/services/cms/solutionService';
+
+export default defineEventHandler(async (event) => {
+  const id = getRouterParam(event, 'id');
+  if (!id)
+    throw createError({
+      statusCode: 400,
+      statusMessage: 'Solution ID is required',
+    });
+
+  const locale = getHeader(event, 'x-locale') || 'zh-CN';
+
+  return solutionService.getSolutionById(id, locale);
+});