optimize mobile workspace and release automation

android/app/build.gradle.kts

@@ -1,3 +1,12 @@
+import java.io.FileInputStream
+import java.util.Properties
+
+val keystoreProperties = Properties()
+val keystorePropertiesFile = rootProject.file("key.properties")
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}
+
 plugins {
     id("com.android.application")
     id("kotlin-android")
@@ -30,11 +39,25 @@ android {
         versionName = flutter.versionName
     }
 
+    signingConfigs {
+        if (keystorePropertiesFile.exists()) {
+            create("release") {
+                keyAlias = keystoreProperties["keyAlias"] as String
+                keyPassword = keystoreProperties["keyPassword"] as String
+                storeFile = file(keystoreProperties["storeFile"] as String)
+                storePassword = keystoreProperties["storePassword"] as String
+            }
+        }
+    }
+
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
-            // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig = signingConfigs.getByName("debug")
+            signingConfig = if (keystorePropertiesFile.exists()) {
+                signingConfigs.getByName("release")
+            } else {
+                // Keep local release runs usable; CI always supplies a release key.
+                signingConfigs.getByName("debug")
+            }
         }
     }
 }

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <application
-        android:label="光鸭云盘"
+        android:label="小黄鸭"
         android:usesCleartextTraffic="true"
         android:requestLegacyExternalStorage="true"
         android:name="${applicationName}"