feat: 用 productFlavors 区分调试和发布包名

dev: com.xiaoqu.watch（调试用，和旧版不冲突，可直接装到手表）
prod: com.witClean.watch（正式发布，用旧签名打包走 OTA 升级）

日常开发选 devDebug，发布时选 prodRelease + witcleaning2.keystore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/build.gradle.kts

@@ -10,7 +10,7 @@ android {
     compileSdk = 36
 
     defaultConfig {
-        applicationId = "com.witClean.watch"
+        applicationId = "com.xiaoqu.watch"
         minSdk = 27
         targetSdk = 27
         versionCode = 183
@@ -19,6 +19,21 @@ android {
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
 
+    // 发布时用 productFlavors 切换包名：
+    // dev: com.xiaoqu.watch（调试用，和旧版不冲突）
+    // prod: com.witClean.watch（正式发布，旧版 OTA 升级）
+    flavorDimensions += "env"
+    productFlavors {
+        create("dev") {
+            dimension = "env"
+            applicationId = "com.xiaoqu.watch"
+        }
+        create("prod") {
+            dimension = "env"
+            applicationId = "com.witClean.watch"
+        }
+    }
+
     buildTypes {
         debug {
             buildConfigField("String", "SERVICE_URL", "\"https://app.updatexiaoqu.com:9443/\"")