refactor: update CI for native per-OS runners

- Replace generic "linux" runner label with dedicated per-OS labels
  (ubuntu-24.04, fedora, alpine, arch)
- Remove all container declarations (native runner execution)
- Add build gate dependencies: build jobs need fmt+clippy+test
- Extract release upload logic into reusable scripts/upload-release.sh
- Fix build-alpine.sh: remove hardcoded container paths, add
  SKIP_CARGO_BUILD support
- Fix build-arch.sh: remove hardcoded container paths, add
  SKIP_CARGO_BUILD support
- Fix build-rpm.sh: remove sudo, native runner compatible
- Remove Dockerfile.rpm and Dockerfile.arch (no longer needed)
- Add sudo to Ubuntu/Fedora/Arch package installs for safety
- Add nodejs to Alpine deps for Gitea Actions compatibility
- Make upload-release.sh POSIX sh compatible (Alpine)
- Fix curl -sf to curl -s in upload-release.sh (404 on new releases)

build-rpm.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 # Build RPM Package for RHEL/CentOS/Fedora
 # Run on: RHEL 8/9, CentOS 8/9, Fedora 38+
+# Designed for native Gitea Actions runner execution
 
 set -e
 
@@ -11,9 +12,9 @@ echo ""
 if ! command -v rpmbuild &> /dev/null; then
     echo "Installing RPM build tools..."
     if command -v dnf &> /dev/null; then
-        sudo dnf install -y rpm-build cargo rust gcc systemd-devel
+        dnf install -y rpm-build cargo rust gcc systemd-devel
     elif command -v yum &> /dev/null; then
-        sudo yum install -y rpm-build cargo rust gcc systemd-devel
+        yum install -y rpm-build cargo rust gcc systemd-devel
     else
         echo "Error: Cannot install rpm-build. Please install manually."
         exit 1
@@ -57,6 +58,6 @@ echo "=== Build Complete ==="
 echo "Package: releases/linux-patch-api-*.rpm"
 echo ""
 echo "Install with:"
-echo "  sudo dnf install -y ./releases/linux-patch-api-*.rpm"
+echo "  dnf install -y ./releases/linux-patch-api-*.rpm"
 echo "  # or"
-echo "  sudo yum install -y ./releases/linux-patch-api-*.rpm"
+echo "  yum install -y ./releases/linux-patch-api-*.rpm"