feat: adiciona menu Desenvolvedor as configuracoes, nova modal Sobre e icones da marca TatuChat

- Submenu Desenvolvedor em Configuracoes (Sobre o servidor, Registros, Variaveis e ambiente)
- Modal Sobre maior com logo, descricao com link e rodape (codigo-fonte, licenca, fechar)
- Descricao legivel no tema dark
- Drawer com a logo do projeto e links de support/formulario atualizados
- flutter_launcher_icons: regenera icones Android (mipmap + adaptive), Web, iOS, macOS, Windows

lib/config/app_config.dart

@@ -36,10 +36,13 @@ abstract class AppConfig {
   static const String muralTag = 'tatuchat_mural';
 
   static const String sourceCodeUrl =
-      'https://github.com/krille-chan/fluffychat';
+      'https://gitea.weltonmoura.com.br/welton/tatuchat';
+  static const String licenseUrl =
+      'https://gitea.weltonmoura.com.br/welton/tatuchat/src/branch/main/LICENSE';
   static const String supportUrl =
-      'https://github.com/krille-chan/fluffychat/issues';
-  static const String changelogUrl = 'https://fluffychat.im/changelog/';
+      'https://gitea.weltonmoura.com.br/welton/tatuchat/issues';
+  static const String changelogUrl =
+      'https://tatuchat.weltonmoura.com.br/home/';
   static const String helpUrl =
       'https://ko-fi.com/post/How-can-I-support-FluffyChat-J2G325WE6I';
 
@@ -47,8 +50,8 @@ abstract class AppConfig {
 
   static final Uri newIssueUrl = Uri(
     scheme: 'https',
-    host: 'github.com',
-    path: '/krille-chan/fluffychat/issues/new',
+    host: 'gitea.weltonmoura.com.br',
+    path: '/welton/tatuchat/issues/new',
   );
 
   static final Uri homeserverList = Uri(