Add blog post admin CRUD API.

Expose JWT-protected /blog-posts endpoints for draft creation, listing, update, and delete.

backend/src/modules/blog/dto/ListBlogPostsQueryDto.ts

@@ -0,0 +1,17 @@
+import { Type } from 'class-transformer';
+import { IsInt, IsOptional, Max, Min } from 'class-validator';
+
+export class ListBlogPostsQueryDto {
+    @IsOptional()
+    @Type(() => Number)
+    @IsInt()
+    @Min(1)
+    page?: number;
+
+    @IsOptional()
+    @Type(() => Number)
+    @IsInt()
+    @Min(1)
+    @Max(100)
+    limit?: number;
+}

backend/src/modules/blog/dto/UpdateBlogPostDto.ts

@@ -0,0 +1,21 @@
+import { IsBoolean, IsNotEmpty, IsString, MaxLength } from 'class-validator';
+
+import { getAppConfig } from '../../../config';
+
+const {
+    validation: { blogPostTitleMaxLength }
+} = getAppConfig();
+
+export class UpdateBlogPostDto {
+    @IsNotEmpty()
+    @IsString()
+    @MaxLength(blogPostTitleMaxLength)
+    title: string;
+
+    @IsString()
+    contentHtml: string;
+
+    @IsNotEmpty()
+    @IsBoolean()
+    isDraft: boolean;
+}