Add tools/addon exit codes and use them

Introduce exit codes 232-238 for Tools & Addon scripts in misc/api.func and misc/error_handler.func. Update addon scripts (tools/addon/adguardhome-sync.sh, tools/addon/copyparty.sh, tools/addon/cronmaster.sh) to return specific codes instead of generic exit 1: 238 for unsupported OS and 233 when the application is not installed/upgrade prerequisites are missing. This makes failures more descriptive and aligns scripts with the central error explanations.

tools/addon/adguardhome-sync.sh

@@ -69,7 +69,7 @@ elif [[ -f "/etc/debian_version" ]]; then
   SERVICE_PATH="/etc/systemd/system/adguardhome-sync.service"
 else
   msg_error "Unsupported OS detected. Exiting."
-  exit 1
+  exit 238
 fi
 
 # ==============================================================================
@@ -312,7 +312,7 @@ if [[ "${type:-}" == "update" ]]; then
     update
   else
     msg_error "${APP} is not installed. Nothing to update."
-    exit 1
+    exit 233
   fi
   exit 0
 fi

tools/addon/copyparty.sh

@@ -49,7 +49,7 @@ elif grep -qE 'ID=debian|ID=ubuntu' /etc/os-release; then
   SERVICE_PATH="/etc/systemd/system/copyparty.service"
 else
   msg_error "Unsupported OS detected. Exiting."
-  exit 1
+  exit 238
 fi
 
 # ==============================================================================
@@ -318,7 +318,7 @@ if [[ "${type:-}" == "update" ]]; then
     update
   else
     msg_error "${APP} is not installed. Nothing to update."
-    exit 1
+    exit 233
   fi
   exit 0
 fi

tools/addon/cronmaster.sh

@@ -51,7 +51,7 @@ EOF
 # ==============================================================================
 if ! grep -qE 'ID=debian|ID=ubuntu' /etc/os-release 2>/dev/null; then
   echo -e "${CROSS} Unsupported OS detected. This script only supports Debian and Ubuntu."
-  exit 1
+  exit 238
 fi
 
 # ==============================================================================
@@ -183,7 +183,7 @@ if [[ "${type:-}" == "update" ]]; then
     update
   else
     msg_error "${APP} is not installed. Nothing to update."
-    exit 1
+    exit 233
   fi
   exit 0
 fi