feat(mobile,deploy): 接入安卓极光与华为通道并准备公网部署配置

客户端默认指向 jxd.jinniu.ink 的 HTTPS/WSS；登录后把 OpenIM userID 设为极光 alias。
华为 agconnect-services.json 不伪造、不入库。Master Secret 只从服务器文件注入。

Co-authored-by: multica-agent <github@multica.ai>

mobile/android/app/build.gradle.kts

@@ -4,6 +4,13 @@ plugins {
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+// 华为 agconnect-services.json 到位后才启用 AGConnect 插件，避免缺文件时整包编不过。
+// 文件从华为 AppGallery Connect 下载，放到本目录，不要提交进 Git。
+val agconnectServices = file("agconnect-services.json")
+if (agconnectServices.exists()) {
+    apply(plugin = "com.huawei.agconnect")
+}
+
 android {
     namespace = "cn.solsum.jinxunda"
     compileSdk = flutter.compileSdkVersion
@@ -15,14 +22,15 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId = "cn.solsum.jinxunda"
-        // You can update the following values to match your application needs.
-        // For more information, see: https://flutter.dev/to/review-gradle-config.
-        minSdk = flutter.minSdkVersion
+        // 极光厂商通道插件要求 minSdk 24
+        minSdk = 24
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName
+        manifestPlaceholders["JPUSH_PKGNAME"] = "cn.solsum.jinxunda"
+        manifestPlaceholders["JPUSH_APPKEY"] = "95fc2352648a7d4568ac8d72"
+        manifestPlaceholders["JPUSH_CHANNEL"] = "developer-default"
     }
 
     // 压缩打包 .so（默认未压缩存储，OpenIM/WebRTC 的 native 库让包多占近一倍体积）；