fix: correct arch naming and build order for ARM64 packages

- nfpm.yaml: use ${NFPM_ARCH} (Go's ExpandEnv doesn't support :-default)
- arch-helper.sh: export RPM_ARCH (x86_64/aarch64) alongside NFPM_ARCH
- build-rpm/deb.sh: build TypeScript before running tests (tests need
  built @mcpctl/shared), generate Prisma client on fresh checkout
- Fix RPM filename matching to use aarch64 not arm64

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

installlocal.sh

@@ -29,10 +29,10 @@ fi
 echo "==> Detected package format: $PKG_FORMAT (arch: $NFPM_ARCH)"
 
 # Find package matching the target architecture
+# RPM uses x86_64/aarch64, DEB uses amd64/arm64
 find_pkg() {
   local pattern="$1"
-  # Filter by architecture name in filename
-  ls $pattern 2>/dev/null | grep -E "[._]${NFPM_ARCH}[._]" | head -1
+  ls $pattern 2>/dev/null | grep -E "[._](${NFPM_ARCH}|${RPM_ARCH})[._]" | head -1
 }
 
 if [ "$PKG_FORMAT" = "rpm" ]; then