增强文章控制器的安全性，添加JWT身份验证守卫；优化训练计划服务，简化日志记录逻辑，确保使用计划创建训练会话时的准确性；更新训练会话模型，允许训练计划ID为可空字段。

src/articles/articles.controller.ts

@@ -6,7 +6,7 @@ import { CreateArticleDto, QueryArticlesDto, CreateArticleResponseDto, QueryArti
 
 @ApiTags('articles')
 @Controller('articles')
-@UseGuards(JwtAuthGuard)
+
 export class ArticlesController {
   constructor(private readonly articlesService: ArticlesService) { }
 
@@ -15,12 +15,14 @@ export class ArticlesController {
   @ApiOperation({ summary: '创建文章' })
   @ApiBody({ type: CreateArticleDto })
   @ApiResponse({ status: 200 })
+  @UseGuards(JwtAuthGuard)
   async create(@Body() dto: CreateArticleDto): Promise<CreateArticleResponseDto> {
     return this.articlesService.create(dto);
   }
 
   @Get('list')
   @HttpCode(HttpStatus.OK)
+  @UseGuards(JwtAuthGuard)
   @ApiOperation({ summary: '查询文章列表（分页）' })
   async list(@Query() query: QueryArticlesDto): Promise<QueryArticlesResponseDto> {
     return this.articlesService.query(query);
@@ -36,6 +38,7 @@ export class ArticlesController {
   // 增加阅读数
   @Post(':id/read-count')
   @HttpCode(HttpStatus.OK)
+  @UseGuards(JwtAuthGuard)
   @ApiOperation({ summary: '增加文章阅读数' })
   async increaseReadCount(@Param('id') id: string): Promise<CreateArticleResponseDto> {
     return this.articlesService.increaseReadCount(id);