reorganize build scripts

pubspec.yaml

@@ -67,18 +67,19 @@ melos:
     format:
       description: Format all Dart files in the workspace
       exec: dart format .
-    build-browser:
-      description: Run all preparation scripts and build APK + App Bundle
+    update-assets:
+      description: Download external assets (bangs, bridges, URL lists)
+      run: bash scripts/update-assets.sh
+    build-components:
+      description: Build JS components and generate quotes DB
       run: |
         set -e
-        echo "=== Running preparation scripts ==="
         sh scripts/build-container-proxy.sh
         sh scripts/build-readability.sh
-        bash scripts/download_bangs.sh
         python3 scripts/build_quotes_db.py
-        sh scripts/update-bridges.sh
-        sh scripts/update-url-cleaner-catalog.sh
-        sh scripts/update-url-shorteners.sh
-        echo "=== Building APK ==="
+    build-browser:
+      description: Build release APK split per ABI
+      run: |
+        set -e
         cd app
         flutter build apk --release --target-platform android-arm,android-arm64 --split-per-abi --no-tree-shake-icons