feat: enable additional comment/search sort types for PieFed, improve image handling for PieFed, improve api and comment logic

Author: hjiangsu

lib/src/core/enums/comment_sort_type.dart

@@ -5,7 +5,7 @@ enum CommentSortType {
   top('Top'),
   new_('New'),
   old('Old'),
-  controversial('Controversial', platform: ThreadiversePlatform.lemmy);
+  controversial('Controversial');
 
   /// The value of the sort type for the API.
   final String value;

lib/src/core/enums/feed_list_type.dart

@@ -5,6 +5,7 @@ enum FeedListType {
   local('Local'),
   subscribed('Subscribed'),
   moderatorView('ModeratorView'),
+  moderating('Moderating', platform: ThreadiversePlatform.piefed),
   popular('Popular', platform: ThreadiversePlatform.piefed);
 
   /// The value of the enum. This corresponds to the value used in the request.

lib/src/core/enums/meta_search_type.dart

@@ -3,12 +3,12 @@ import 'package:thunder/l10n/generated/app_localizations.dart';
 import 'package:thunder/src/core/enums/threadiverse_platform.dart';
 
 enum MetaSearchType {
-  all(searchType: 'All'),
-  comments(searchType: 'Comments'),
-  posts(searchType: 'Posts'),
-  communities(searchType: 'Communities'),
-  users(searchType: 'Users', platform: ThreadiversePlatform.lemmy),
-  url(searchType: 'Url', platform: ThreadiversePlatform.lemmy),
+  all(searchType: 'All'),
+  comments(searchType: 'Comments'),
+  posts(searchType: 'Posts'),
+  communities(searchType: 'Communities'),
+  users(searchType: 'Users'),
+  url(searchType: 'Url'),
   instances(),
   ;