feat: Implement blog and blog post models, routes, and services

- Added Blog and BlogPost models with necessary fields and relationships.
- Created blogRouter for handling blog-related API endpoints including CRUD operations.
- Developed BlogService for business logic related to blogs and posts, including sharing functionality.
- Implemented API client methods for frontend to interact with blog-related endpoints.
- Added internationalization support for blog-related text in English and German.
- Created Vue components for blog editing, listing, and viewing, including a rich text editor for post content.
- Enhanced user experience with form validations and dynamic visibility settings based on user input.

backend/app.js

@@ -11,6 +11,7 @@ import socialnetworkRouter from './routers/socialnetworkRouter.js';
 import forumRouter from './routers/forumRouter.js';
 import falukantRouter from './routers/falukantRouter.js';
 import friendshipRouter from './routers/friendshipRouter.js';
+import blogRouter from './routers/blogRouter.js';
 import cors from 'cors';
 import './jobs/sessionCleanup.js';
 
@@ -40,9 +41,16 @@ app.use('/api/socialnetwork', socialnetworkRouter);
 app.use('/api/forum', forumRouter);
 app.use('/api/falukant', falukantRouter);
 app.use('/api/friendships', friendshipRouter);
+app.use('/api/blog', blogRouter);
 
-app.use((req, res) => {
-  res.status(404).send('404 Not Found');
+// Serve frontend SPA for non-API routes to support history mode clean URLs
+const frontendDir = path.join(__dirname, '../frontend');
+app.use(express.static(path.join(frontendDir, 'dist')));
+app.get(/^\/(?!api\/).*/, (req, res) => {
+  res.sendFile(path.join(frontendDir, 'dist', 'index.html'));
 });
 
+// Fallback 404 for unknown API routes
+app.use('/api/*', (req, res) => res.status(404).send('404 Not Found'));
+
 export default app;