Remove legacy scripts and single-tenant support

- Deleted the migration script `migrate-to-multitenant.sh` as it is no longer needed.
- Removed `rebuild-venv.sh`, `restore.sh`, `run-backup.sh`, and other related scripts that are not compatible with the new multi-tenant architecture.
- Updated `restart.sh`, `start.sh`, `stop.sh`, `update.sh`, and other scripts to eliminate references to single-tenant deployment, ensuring they only support multi-tenant configurations.

Co-authored-by: Copilot <copilot@github.com>

start.sh

@@ -37,7 +37,6 @@ Options:
   --no-cron         Do not create or update cron jobs
   --with-cron       Create/update cron jobs (default)
   --multitenant     Use the multi-tenant architecture deployment
-    --singletenant    Use the legacy single-tenant compose deployment
   -h, --help        Show this help message
 EOF
 }
@@ -57,10 +56,6 @@ parse_args() {
                 COMPOSE_FILE="docker-compose-multitenant.yml"
                 shift
                 ;;
-            --singletenant)
-                COMPOSE_FILE="docker-compose.yml"
-                shift
-                ;;
             -h|--help)
                 usage
                 exit 0
@@ -584,15 +579,19 @@ EOF
 
     if [ -n "$HTTP_PORTS_VALUE" ]; then
         local ports_array
-        read -r -a ports_array <<<"$HTTP_PORTS_VALUE"
-        if [ "${#ports_array[@]}" -gt 1 ]; then
+        local ports_list
+        ports_list="${HTTP_PORTS_VALUE//,/ }"
+        read -r -a ports_array <<<"$ports_list"
+        if [ "${#ports_array[@]}" -gt 0 ]; then
             cat >> "$RUNTIME_COMPOSE_OVERRIDE_FILE" <<EOF
     ports:
 EOF
             for port in "${ports_array[@]}"; do
-                cat >> "$RUNTIME_COMPOSE_OVERRIDE_FILE" <<EOF
+                if [ -n "$port" ]; then
+                    cat >> "$RUNTIME_COMPOSE_OVERRIDE_FILE" <<EOF
       - "$port:8000"
 EOF
+                fi
             done
         fi
     fi