Simplify Android build workflow: use bundletool + eas submit

Replace the redundant second EAS build (production-apk) with bundletool
to generate a universal APK from the AAB. Add eas submit to auto-submit
to Google Play for both profiles. Both profiles now follow the same
path: Build AAB → eas submit → bundletool APK → upload artifact → Slack.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

eas.json

@@ -47,21 +47,6 @@
         "EXPO_PUBLIC_ENV": "production"
       }
     },
-    "production-apk": {
-      "extends": "base",
-      "distribution": "internal",
-      "ios": {
-        "autoIncrement": false,
-        "buildArtifactPaths": ["ios/build/*"]
-      },
-      "android": {
-        "autoIncrement": false
-      },
-      "channel": "production",
-      "env": {
-        "EXPO_PUBLIC_ENV": "production"
-      }
-    },
     "testflight": {
       "extends": "base",
       "ios": {
@@ -78,7 +63,6 @@
     },
     "testflight-android": {
       "extends": "base",
-      "distribution": "internal",
       "ios": {
         "autoIncrement": true,
         "buildArtifactPaths": ["ios/build/*"]
@@ -96,6 +80,14 @@
     "production": {
       "ios": {
         "ascAppId": "6444370199"
+      },
+      "android": {
+        "track": "production"
+      }
+    },
+    "testflight-android": {
+      "android": {
+        "track": "internal"
       }
     }
   }