chore: configure for Play Store release

- Change application ID to id.ptsemangat.siab_scale
- Move Kotlin package to id/ptsemangat/siab_scale
- Update iOS/macOS/Linux/Windows bundle identifiers
- Configure release signing in both build.gradle files
- Add proguard-rules.pro
- Add key.properties.example template
- Add privacy policy placeholders (en/id)
- Add Gitea CI workflow for AAB builds
- Add RELEASE_CHECKLIST.md
- Update copyrights to PT. Semangat Inovasi Anak Bangsa

web/manifest.json

@@ -1,11 +1,11 @@
 {
-    "name": "siab_bluetooth_app",
-    "short_name": "siab_bluetooth_app",
+    "name": "SIAB Scale",
+    "short_name": "SIAB Scale",
     "start_url": ".",
     "display": "standalone",
     "background_color": "#0175C2",
     "theme_color": "#0175C2",
-    "description": "A new Flutter project.",
+    "description": "SIAB Bluetooth streaming data app for Android",
     "orientation": "portrait-primary",
     "prefer_related_applications": false,
     "icons": [