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>

scripts/arch-helper.sh

@@ -3,7 +3,8 @@
 # Source this file, then call: resolve_arch [target_arch]
 #
 # Outputs (exported):
-#   NFPM_ARCH    — nfpm/deb/rpm arch name: "amd64" or "arm64"
+#   NFPM_ARCH    — nfpm arch name: "amd64" or "arm64"
+#   RPM_ARCH     — RPM arch name: "x86_64" or "aarch64"
 #   BUN_TARGET   — bun cross-compile target (empty if native build)
 #   ARCH_SUFFIX  — filename suffix for cross-compiled binaries (empty if native)
 
@@ -57,6 +58,13 @@ resolve_arch() {
     fi
   fi
 
-  export NFPM_ARCH BUN_TARGET ARCH_SUFFIX
+  # RPM uses different arch names than deb/nfpm
+  case "$NFPM_ARCH" in
+    amd64) RPM_ARCH="x86_64" ;;
+    arm64) RPM_ARCH="aarch64" ;;
+    *)     RPM_ARCH="$NFPM_ARCH" ;;
+  esac
+
+  export NFPM_ARCH RPM_ARCH BUN_TARGET ARCH_SUFFIX
   echo "  Architecture: ${NFPM_ARCH} (native: ${native}${BUN_TARGET:+, cross-compiling via $BUN_TARGET})"
 }