fix(api): implement auto-serialization for _json fields in V3 create/update

- Added logic to automatically JSON.stringify any field ending in '_json' in V3 API helpers.
- Added final payload logging to create_ae_obj_v3 for better debugging.
- Resolves 'str type expected' validation errors (HTTP 400) when sending objects to V3 CRUD endpoints.

src/lib/ae_api/api_post__crud_obj_v3.ts

@@ -34,11 +34,15 @@ export async function create_ae_obj_v3({
     const cleaned_fields = { ...fields };
     for (const key in cleaned_fields) {
         if (key.endsWith('_json') && cleaned_fields[key] !== null && typeof cleaned_fields[key] === 'object') {
-            if (log_lvl > 1) console.log(`Auto-serializing field: ${key}`);
+            if (log_lvl) console.log(`Auto-serializing field: ${key}`);
             cleaned_fields[key] = JSON.stringify(cleaned_fields[key]);
         }
     }
 
+    if (log_lvl) {
+        console.log('Cleaned Fields (Final):', cleaned_fields);
+    }
+
     return await post_object({
         api_cfg,
         endpoint,