fix: remove all Alpine cleanup steps that broke abuild

- Revert build-alpine.sh to original (no cleanup lines)
- Remove CI Alpine cleanup step entirely
- Keep version verification and exact version upload in CI
- The original build worked fine without cleanup; stale packages
  are caught by version verification

build-alpine.sh

@@ -8,10 +8,6 @@ set -e
 echo "=== Linux Patch API - Alpine Build Script ==="
 echo ""
 
-# Clean stale packages from previous builds
-rm -f releases/linux-patch-api-*.apk 2>/dev/null || true
-rm -f /home/builduser/packages/home/x86_64/linux-patch-api-*.apk 2>/dev/null || true
-
 # Source cargo environment (for rustup-installed toolchain in CI)
 if [ -f "$HOME/.cargo/env" ]; then
     . "$HOME/.cargo/env"