build: 配置 release 签名（keystore.properties 已 .gitignore），支持 assembleRelease/bundleRelease

.gitignore

@@ -6,3 +6,7 @@ local.properties
 !apk/*.apk
 tools/
 notes.txt
+keystore.properties
+*.jks
+*.keystore
+*.aab

app/build.gradle.kts

@@ -1,8 +1,16 @@
+import java.util.Properties
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
 }
 
+// release 签名：从仓库根的 keystore.properties 读取（该文件已 .gitignore，缺失时不影响 debug 构建）
+val ksProps = Properties().apply {
+    val f = rootProject.file("keystore.properties")
+    if (f.exists()) f.inputStream().use { load(it) }
+}
+
 android {
     namespace = "com.iptv807.tv"
     compileSdk = 35
@@ -15,9 +23,21 @@ android {
         versionName = "9.3.0"
     }
 
+    signingConfigs {
+        if (ksProps.isNotEmpty()) {
+            create("release") {
+                storeFile = rootProject.file(ksProps.getProperty("storeFile", ""))
+                storePassword = ksProps.getProperty("storePassword")
+                keyAlias = ksProps.getProperty("keyAlias")
+                keyPassword = ksProps.getProperty("keyPassword")
+            }
+        }
+    }
+
     buildTypes {
         release {
             isMinifyEnabled = false
+            signingConfig = signingConfigs.findByName("release")
             proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
         }
     }