Use exit 105 for unsupported PVE versions

Standardize error handling by replacing generic exit 1 with exit 105 in pve_check() across multiple VM template scripts to indicate unsupported Proxmox VE versions. Also add API exit code 226 message for "Proxmox: VM disk import or post-creation setup failed" in misc/api.func. Affected files include misc/api.func and various vm/*-vm.sh scripts.

vm/debian-vm.sh

@@ -158,7 +158,7 @@ pve_check() {
     if ((MINOR < 0 || MINOR > 9)); then
       msg_error "This version of Proxmox VE is not supported."
       msg_error "Supported: Proxmox VE version 8.0 – 8.9"
-      exit 1
+      exit 105
     fi
     return 0
   fi
@@ -169,7 +169,7 @@ pve_check() {
     if ((MINOR < 0 || MINOR > 1)); then
       msg_error "This version of Proxmox VE is not supported."
       msg_error "Supported: Proxmox VE version 9.0 – 9.1"
-      exit 1
+      exit 105
     fi
     return 0
   fi
@@ -177,7 +177,7 @@ pve_check() {
   # All other unsupported versions
   msg_error "This version of Proxmox VE is not supported."
   msg_error "Supported versions: Proxmox VE 8.0 – 8.x or 9.0 – 9.1"
-  exit 1
+  exit 105
 }
 
 function arch_check() {