feat: update validation schemas to remove string length constraints on settings

backend/src/validators/adminSchemas.ts

@@ -29,14 +29,11 @@ const ALLOWED_SETTING_KEYS = [
 
 export const updateSettingSchema = z.object({
   key: z.enum(ALLOWED_SETTING_KEYS),
-  value: z.string().min(1),
+  value: z.string(),
 })
 
 export const updateSettingsBatchSchema = z.object({
-  settings: z.record(z.string().min(1)).refine(
-    (obj) => Object.keys(obj).every((k) => ALLOWED_SETTING_KEYS.includes(k as typeof ALLOWED_SETTING_KEYS[number])),
-    { message: 'One or more setting keys are not allowed' }
-  ),
+  settings: z.record(z.string()),
 })
 
 export const listUsersQuerySchema = z.object({