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.

frontend/src/api/blogApi.js

@@ -0,0 +1,19 @@
+import apiClient from '@/utils/axios.js';
+
+export const listBlogs = async () => (await apiClient.get('/api/blog/blogs')).data;
+export const getBlog = async (id) => (await apiClient.get(`/api/blog/blogs/${id}`)).data;
+export const listPosts = async (id, { page = 1, pageSize = 10 } = {}) => (await apiClient.get(`/api/blog/blogs/${id}/posts`, { params: { page, pageSize } })).data;
+
+export const createBlog = async (payload) => (await apiClient.post('/api/blog/blogs', payload)).data;
+export const updateBlog = async (id, payload) => (await apiClient.put(`/api/blog/blogs/${id}`, payload)).data;
+export const createPost = async (id, payload) => (await apiClient.post(`/api/blog/blogs/${id}/posts`, payload)).data;
+export const listBlogImages = async (id) => (await apiClient.get(`/api/blog/blogs/${id}/images`)).data;
+export const uploadBlogImage = async (id, file, meta = {}) => {
+	const formData = new FormData();
+	formData.append('image', file);
+	if (meta.title) formData.append('title', meta.title);
+	if (meta.description) formData.append('description', meta.description);
+	return (await apiClient.post(`/api/blog/blogs/${id}/images`, formData, { headers: { 'Content-Type': 'multipart/form-data' } })).data;
+};
+export const shareBlog = async (id, payload) => (await apiClient.post(`/api/blog/blogs/${id}/share`, payload)).data;
+