feat(Moderation): enhance moderation reporting and user feedback

- Added user blocking checks in authentication and reporting processes, returning appropriate error responses.
- Expanded moderation report functionality to include new target types and optional fields for reports.
- Implemented a new API endpoint to retrieve the count of open moderation reports.
- Enhanced frontend components to allow users to report profiles, images, and guestbook entries, with corresponding UI updates.
- Updated internationalization files to include new strings for reporting features in both German and English.

frontend/src/i18n/locales/en/blog.json

@@ -22,6 +22,10 @@
     "view": {
       "loading": "Loading…",
       "edit": "Edit",
+      "reportBlog": "Report blog",
+      "reportPost": "Report post",
+      "reportBlogSent": "Blog has been reported to moderation.",
+      "reportPostSent": "Post has been reported to moderation.",
       "entriesCount": "{count} entries",
       "empty": "No entries available.",
       "fallbackDescription": "Public community blog on YourPart.",