Segunda revisión completa: fixes críticos aplicados

- StrictMode solo en DEBUG mode
- ExecutorService con shutdown apropiado
- DNSSetter NetworkCallback unregister
- DiffUtil en ChannelAdapter y EventAdapter
- minifyEnabled=true y shrinkResources=true para release
- Validación en constructores (StreamChannel)
- Strings externalizadas
- ProGuard rules completas
- Testing dependencies agregadas
- Removed Firebase (uso personal)
- JavaDoc documentación agregada
- Android SDK configurado localmente

Compilado exitosamente: StreamPlayer v9.4.2 debug APK (11MB)

dashboard/node_modules/ignore-by-default/LICENSE

@@ -0,0 +1,14 @@
+ISC License (ISC)
+Copyright (c) 2016, Mark Wubben
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.