Fix avatar API to return all fields, add TMPDIR workaround to import script

- Use to_encoach_dict() for /api/exam/avatars so voiceId, voiceProvider,
  canvas are included in the response
- Set TMPDIR=/tmp in import script for PyTorch compatibility in Docker

Made-with: Cursor

scripts/import_training_tips.py

@@ -1,7 +1,8 @@
 """Import training tips from pathways JSON into encoach.training.tip model.
 
 Run inside the Odoo container via:
-    odoo shell -d encoach < /mnt/custom/scripts/import_training_tips.py
+    odoo shell -d encoach --db_host=db --db_user=odoo --db_password=<pw> \
+        --no-http --addons-path=... < /mnt/custom/scripts/import_training_tips.py
 
 This script:
   1. Reads pathways_2_rw.json
@@ -13,6 +14,8 @@ import os
 import pickle
 import sys
 
+os.environ.setdefault("TMPDIR", "/tmp")
+
 JSON_PATH = os.environ.get(
     "TIPS_JSON_PATH",
     "/mnt/custom/scripts/pathways_2_rw.json",