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

assets/logo/vector/logo_background.svg

@@ -2,9 +2,9 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200">
   <defs>
     <linearGradient id="background" x1="0%" y1="0%" x2="0%" y2="100%">
-      <stop offset="0" style="stop-color:#7c67e4; stop-opacity:1" />
-      <stop offset="1" style="stop-color:#261386; stop-opacity:1" />
+      <stop offset="0" style="stop-color:#7c67e4; stop-opacity:0" />
+      <stop offset="1" style="stop-color:#261386; stop-opacity:0" />
     </linearGradient>
   </defs>
   <rect width="200" height="200" fill="url(#background)" />
-</svg>
+</svg>