Fix model-controller mismatches and routing issues

- ticket: add user_id, priority, category fields; fix _serialize_ticket -> _serialize
- package: fix is_active -> active (Odoo auto-filter), remove invalid entity_id filter
- walkthrough: add sequence field; fix controller to use name/content instead of title/steps
- users: fix encoach_user_type -> encoach_type, encoach_entity_id -> entity_rel_ids.entity_id
- generation: use EncoachGenerationService class instead of nonexistent ORM model,
  fix /api/exam/level/ route conflict (separate GET and POST URLs)

Made-with: Cursor

encoach_api/controllers/training.py

@@ -105,10 +105,10 @@ class TrainingController(EncoachMixin, http.Controller):
             data = [{
                 '_id': str(w.id),
                 'id': w.id,
-                'title': getattr(w, 'title', ''),
-                'description': getattr(w, 'description', ''),
-                'steps': json.loads(w.steps) if getattr(w, 'steps', None) else [],
-                'module': getattr(w, 'module', ''),
+                'title': w.name or '',
+                'description': '',
+                'steps': w.content if isinstance(w.content, list) else (json.loads(w.content) if isinstance(w.content, str) else []),
+                'module': w.module or '',
             } for w in records]
 
             return self._json_response(data)