fix(ci): restore 3-ABI release build now that LXC has 106 GB disk

The runner LXC was bumped from ~56 GB to 106 GB, giving ~70 GB of free
space — well above the ~40 GB a full 3-ABI release build needs. Revert
the disk-budget workarounds added in ab35fcf:

- Remove "Free disk space" step (no longer needed)
- Restore x86_64 target (arm64-v8a + armeabi-v7a + x86_64)
- Remove ABIS override so build script uses its full default set

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

.gitea/workflows/android-release.yml

@@ -25,18 +25,6 @@ jobs:
         id: meta
         run: echo "tag=${GITHUB_REF_NAME}" >> "$GITHUB_OUTPUT"
 
-      # ── Free disk space ────────────────────────────────────────────────
-      # A 2-ABI release build (arm64 + armv7) generates ~15 GB of target/
-      # output. Remove pre-installed runner tooling that is never used
-      # during an Android build to reclaim ~10 GB before we start.
-      - name: Free disk space
-        run: |
-          sudo rm -rf /usr/local/lib/android   # runner pre-installed SDK
-          sudo rm -rf /usr/share/dotnet
-          sudo rm -rf /opt/ghc
-          sudo rm -rf /usr/local/share/boost
-          df -h /
-
       # ── System dependencies ────────────────────────────────────────────
       - name: Install system dependencies
         run: |
@@ -79,7 +67,8 @@ jobs:
         run: |
           rustup target add \
             aarch64-linux-android \
-            armv7-linux-androideabi
+            armv7-linux-androideabi \
+            x86_64-linux-android
 
       # ── Cargo caches ───────────────────────────────────────────────────
       - name: Cache Cargo registry
@@ -121,10 +110,6 @@ jobs:
           BUILD_TOOLS_VERSION: ${{ env.BUILD_TOOLS_VERSION }}
           PLATFORM: ${{ env.PLATFORM }}
           PROFILE: release
-          # arm64-v8a covers all modern Android phones; armeabi-v7a covers
-          # legacy ARM devices. x86_64 is emulator-only and dropped to
-          # stay within the runner's ~25 GB disk budget.
-          ABIS: arm64-v8a armeabi-v7a
           KEYSTORE: /tmp/solitaire-release.jks
           KEYSTORE_PASS: ${{ secrets.KEYSTORE_PASS }}
           KEY_ALIAS: ${{ secrets.KEY_ALIAS }}