build: 优化 APK 打包与 AAB 分包配置

排除冗余的 META-INF 许可证与 Kotlin 元数据资源，挑选首次出现的 INDEX.LIST，避免合并冲突；启用按语言、密度、ABI 拆分的 App Bundle。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

androidApp/build.gradle.kts

@@ -40,6 +40,29 @@ android {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
     }
+
+    packaging {
+        resources {
+            excludes += listOf(
+                "/META-INF/{AL2.0,LGPL2.1}",
+                "/META-INF/LICENSE*",
+                "/META-INF/NOTICE*",
+                "META-INF/DEPENDENCIES",
+                "**/*.kotlin_metadata",
+                "**/*.kotlin_module",
+            )
+            pickFirsts += listOf(
+                "META-INF/INDEX.LIST",
+                "META-INF/io.netty.versions.properties",
+            )
+        }
+    }
+
+    bundle {
+        language { enableSplit = true }
+        density { enableSplit = true }
+        abi { enableSplit = true }
+    }
 }
 
 dependencies {