v16.3.1: fix UEFI/OVMF detection on Debian 13 Trixie

Debian Trixie's ovmf package (2025.02+) only ships 4MB firmware
variants (OVMF_CODE_4M.fd, OVMF_VARS_4M.fd), dropping the old 2MB
files. Add the 4M paths as first-priority lookups in all three OVMF
search locations while keeping existing paths as fallbacks.

Author: Paul C

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "wolfstack"
-version = "16.3.0"
+version = "16.3.1"
 edition = "2024"
 authors = ["Wolf Software Systems Ltd"]
 description = "Server management platform for the Wolf software suite"

src/vms/manager.rs

@@ -412,6 +412,7 @@ impl VmManager {
             let vars_dest = self.vm_efivars_path(&config);
             if !vars_dest.exists() {
                 let vars_sources = [
+                    "/usr/share/OVMF/OVMF_VARS_4M.fd",
                     "/usr/share/OVMF/OVMF_VARS.fd",
                     "/usr/share/edk2/x64/OVMF_VARS.fd",
                     "/usr/share/edk2-ovmf/x64/OVMF_VARS.fd",
@@ -981,6 +982,7 @@ impl VmManager {
 
             // OVMF firmware code (read-only)
             let code_paths = [
+                "/usr/share/OVMF/OVMF_CODE_4M.fd",
                 "/usr/share/OVMF/OVMF_CODE.fd",
                 "/usr/share/edk2/x64/OVMF_CODE.fd",
                 "/usr/share/edk2-ovmf/x64/OVMF_CODE.fd",
@@ -1001,6 +1003,7 @@ impl VmManager {
             if !vars_path.exists() {
                 // Create vars file on first boot if it wasn't created during VM creation
                 let vars_sources = [
+                    "/usr/share/OVMF/OVMF_VARS_4M.fd",
                     "/usr/share/OVMF/OVMF_VARS.fd",
                     "/usr/share/edk2/x64/OVMF_VARS.fd",
                     "/usr/share/edk2-ovmf/x64/OVMF_VARS.fd",