app icon, and remove android debug via .dev flavor

- debug .dev flavor doesn't work well with RUST-BACKTRACE and webview devtools
- tauri android run already install debug without dev server

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

@@ -41,7 +41,7 @@ android {
     }
     buildTypes {
         getByName("debug") {
-            applicationIdSuffix = ".dev"
+            // applicationIdSuffix = ".dev"
             manifestPlaceholders["usesCleartextTraffic"] = "true"
             isDebuggable = true
             isJniDebuggable = true