chore(android): scaffold del proyecto Gradle KTS con version catalog

- Gradle 8.9 wrapper + AGP 8.7.3 + Kotlin 2.0.21 (KSP, Hilt, Compose, serialization)
- minSdk 26 / targetSdk 34 / compileSdk 35, package mx.paputec.rachita
- Manifest landscape-only con permisos reservados para módulo de batería
- Recursos base: strings ES-MX, certs de Downloadable Fonts, ícono adaptativo de llama

app/settings.gradle.kts

@@ -0,0 +1,24 @@
+pluginManagement {
+    repositories {
+        google {
+            content {
+                includeGroupByRegex("com\\.android.*")
+                includeGroupByRegex("com\\.google.*")
+                includeGroupByRegex("androidx.*")
+            }
+        }
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "Rachita"
+include(":app")