fix: 修复前端类型标注与GraphQL访问数据不同的问题

- 将类型标注中的id字段改为string

server/mappers/solutionMapper.test.ts

@@ -20,11 +20,11 @@ describe('toSolutionListView', () => {
     const rawData: Solution = { ...baseData };
 
     expect(toSolutionListView(rawData)).toEqual({
-      id: 1,
+      id: '1',
       title: 'Solution Title',
       summary: 'Solution Summary',
       solution_type: {
-        id: 1,
+        id: '1',
         name: 'Type Name',
         sort: 1,
       },
@@ -39,11 +39,11 @@ describe('toSolutionListView', () => {
     };
 
     expect(toSolutionListView(rawData)).toEqual({
-      id: 1,
+      id: '1',
       title: '',
       summary: '',
       solution_type: {
-        id: 1,
+        id: '1',
         name: 'Type Name',
         sort: 1,
       },
@@ -75,7 +75,7 @@ describe('toSolutionView', () => {
     };
 
     expect(toSolutionView(rawData)).toEqual({
-      id: 1,
+      id: '1',
       title: 'Solution Title',
       summary: 'Solution Summary',
       content: 'Solution Content',
@@ -90,7 +90,7 @@ describe('toSolutionView', () => {
     };
 
     expect(toSolutionView(rawData)).toEqual({
-      id: 1,
+      id: '1',
       title: '',
       summary: '',
       content: '',