Add storefront blog pages with nav, templates, and SEO meta.

Wire blogEnabled into shop render locals and expose public blog index and detail routes when the shop toggle is on.

backend/src/modules/storefrontBlog/services/StorefrontBlogPostsService.ts

@@ -0,0 +1,31 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { BlogPost } from '../../blog/entities/BlogPost';
+
+@Injectable()
+export class StorefrontBlogPostsService {
+    constructor(
+        @InjectRepository(BlogPost)
+        private readonly blogPostRepo: Repository<BlogPost>
+    ) {}
+
+    async listLivePosts(): Promise<BlogPost[]> {
+        return this.blogPostRepo.find({
+            where: { isDraft: false },
+            order: { createdAt: 'DESC' }
+        });
+    }
+
+    async getLivePost(id: string): Promise<BlogPost> {
+        const post = await this.blogPostRepo.findOne({
+            where: { id, isDraft: false }
+        });
+
+        if (!post) {
+            throw new NotFoundException('We could not find that blog post.');
+        }
+
+        return post;
+    }
+}