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/models/associations.js

@@ -95,6 +95,8 @@ import PoliticalOfficeHistory from './falukant/log/political_office_history.js';
 import ElectionHistory from './falukant/log/election_history.js';
 import Underground from './falukant/data/underground.js';
 import UndergroundType from './falukant/type/underground.js';
+import Blog from './community/blog.js';
+import BlogPost from './community/blog_post.js';
 
 export default function setupAssociations() {
   // RoomType 1:n Room
@@ -758,4 +760,12 @@ export default function setupAssociations() {
     foreignKey: 'victimId',
     as: 'victimUndergrounds'
   });
+
+  // Blog associations
+  Blog.belongsTo(User, { foreignKey: 'user_id', as: 'owner' });
+  User.hasMany(Blog, { foreignKey: 'user_id', as: 'blogs' });
+  BlogPost.belongsTo(Blog, { foreignKey: 'blog_id', as: 'blog' });
+  Blog.hasMany(BlogPost, { foreignKey: 'blog_id', as: 'posts' });
+  BlogPost.belongsTo(User, { foreignKey: 'user_id', as: 'author' });
+  User.hasMany(BlogPost, { foreignKey: 'user_id', as: 'blogPosts' });
 }