fix(settings): support Persian and flexible SMS variable names and improve save persistence

components/settings/settingService.js

@@ -103,9 +103,9 @@ const saveSettings = async (body = {}) => {
     ? Object.fromEntries(incoming.map((item) => [item.key, item]))
     : incoming;
 
-  const existing = await Setting.findOne({ key: SETTINGS_KEY });
+  const existing = await Setting.findOne({ key: SETTINGS_KEY }).lean();
   const storedMap = existing ? readStoredMap(existing) : emptyTemplateMap();
-  const nextMap = emptyTemplateMap();
+  const nextMap = {};
 
   for (const def of SMS_TEMPLATE_DEFS) {
     const storedEntry = normalizeStoredEntry(storedMap[def.key], def);
@@ -119,7 +119,7 @@ const saveSettings = async (body = {}) => {
       if (incomingEntry.templateId !== undefined) {
         const sanitized = sanitizeTemplateId(incomingEntry.templateId);
         if (sanitized === null) {
-          throw new AppError('VALIDATION_FAILED', { field: def.key }, `Invalid SMS template ID for ${def.key}`);
+          throw new AppError('VALIDATION_FAILED', { field: def.key }, `شناسه قالب پیامک برای ${def.label} نامعتبر است`);
         }
         templateId = sanitized;
       }
@@ -138,16 +138,19 @@ const saveSettings = async (body = {}) => {
           const slot = String(item.slot || '').trim();
           if (!slot) continue;
           const rawName = String(item.name || '').trim();
-          if (!rawName) continue;
           const sanitized = sanitizeVariableName(rawName);
           if (sanitized === null) {
             throw new AppError(
               'VALIDATION_FAILED',
               { field: `${def.key}.${slot}` },
-              `Invalid SMS variable name "${rawName}" for ${def.key}`
+              `نام متغیر «${rawName}» برای ${def.label} نامعتبر است`
             );
           }
-          validVars.push({ slot, name: sanitized });
+          const slotDef = (def?.slots || []).find((s) => s.key === slot);
+          validVars.push({
+            slot,
+            name: sanitized || slotDef?.defaultName || slot
+          });
         }
         variables = validVars;
       }
@@ -165,7 +168,7 @@ const saveSettings = async (body = {}) => {
     { key: SETTINGS_KEY },
     { $set: { smsTemplates: nextMap } },
     { upsert: true, new: true, setDefaultsOnInsert: true }
-  );
+  ).lean();
 
   return {
     smsTemplates: toPublicTemplates(readStoredMap(doc))