feat: add Android client with service integration, UI, and build configuration

.github/workflows/build.yml

@@ -92,8 +92,52 @@ jobs:
           name: binaries-${{ matrix.goos }}-${{ matrix.goarch }}
           path: build/
 
-  release:
+  android-apk:
     needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download all artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+          merge-multiple: true
+
+      - name: Stage Android client binary into assets
+        run: |
+          test -f artifacts/thefeed-client-android-arm64
+          mkdir -p android/app/src/main/assets
+          cp artifacts/thefeed-client-android-arm64 android/app/src/main/assets/thefeed-client
+          chmod +x android/app/src/main/assets/thefeed-client
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Generate wrapper and build debug APK
+        working-directory: android
+        run: |
+          gradle wrapper --gradle-version 8.10.2
+          ./gradlew --no-daemon assembleDebug
+
+      - name: Rename APK
+        run: |
+          cp android/app/build/outputs/apk/debug/app-debug.apk artifacts/thefeed-android-arm64.apk
+
+      - name: Upload Android APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: thefeed-android-apk
+          path: artifacts/thefeed-android-arm64.apk
+
+  release:
+    needs: [build, android-apk]
     if: startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
     steps:
@@ -108,3 +152,4 @@ jobs:
         with:
           files: artifacts/*
           generate_release_notes: true
+          prerelease: ${{ contains(github.ref_name, '-') }}