refactor(android): consolidate signing config and bump SDK to 36

- Remove external android-signing.gradle.kts, inline keystore config
  into app/build.gradle.kts
- Update compileSdk and targetSdk to 36
- Fix version format in package.json (v0.1 → 0.1.0)

src-tauri/gen/android/app/build.gradle.kts

@@ -13,12 +13,11 @@ val tauriProperties = Properties().apply {
     }
 }
 
-// Signing config — reads from external keystore.properties
+// Release signing config
 val keystorePropertiesFile = file("/home/msksbr/Android/keystore.properties")
-val keystoreProperties = Properties().apply {
-    if (keystorePropertiesFile.exists()) {
-        keystorePropertiesFile.inputStream().use { load(it) }
-    }
+val keystoreProperties = Properties()
+if (keystorePropertiesFile.exists()) {
+    keystorePropertiesFile.inputStream().use { keystoreProperties.load(it) }
 }
 
 android {
@@ -89,4 +88,11 @@ dependencies {
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.0")
 }
 
-apply(from = "tauri.build.gradle.kts")
+apply(from = "tauri.build.gradle.kts")
+
+// Also build per-architecture release APKs when universal release is built
+afterEvaluate {
+    tasks.matching { it.name == "assembleUniversalRelease" }.configureEach {
+        dependsOn("assembleArm64Release", "assembleArmRelease", "assembleX86_64Release", "assembleX86Release")
+    }
+}