🐛 fix(files): 修复文件删除接口ID参数类型错误

- 将文件ID参数类型从字符串改为数字类型，确保与后端存储一致
- 更新参数示例值为数字类型，反映正确的使用方式

src/server/api/files/[id]/delete.ts

@@ -12,9 +12,9 @@ const deleteFileRoute = createRoute({
   middleware: [authMiddleware],
   request: {
     params: z.object({
-      id: z.string().openapi({
+      id: z.coerce.number().openapi({
         param: { name: 'id', in: 'path' },
-        example: 'FILE123456',
+        example: 1,
         description: '文件ID'
       })
     })