android: set version 2026.1.5, add APK naming convention, remove duplicate asset

apps/android/app/build.gradle.kts

@@ -20,7 +20,7 @@ android {
     minSdk = 31
     targetSdk = 36
     versionCode = 1
-    versionName = "2.0.0-beta3"
+    versionName = "2026.1.5"
   }
 
   buildTypes {
@@ -29,6 +29,14 @@ android {
     }
   }
 
+  applicationVariants.all {
+    val variant = this
+    outputs.all {
+      val output = this as com.android.build.gradle.internal.api.BaseVariantOutputImpl
+      output.outputFileName = "clawdbot-${variant.versionName}-${variant.buildType.name}.apk"
+    }
+  }
+
   buildFeatures {
     compose = true
     buildConfig = true