fix(audit): centraliser l'horloge UTC

app/models/tryout/tryout.py

@@ -1,9 +1,8 @@
 """Tryout event for player evaluations and team formation."""
 
-from datetime import datetime
-
 from app.extensions import db
 from app.models._associations import tryout_coaches
+from app.time_utils import utc_now_naive
 
 
 class Tryout(db.Model):
@@ -25,7 +24,7 @@ class Tryout(db.Model):
     coach_id = db.Column(
         db.Integer, db.ForeignKey('users.id'), nullable=True
     )  # deprecated, kept for migration
-    created_at = db.Column(db.DateTime, default=datetime.utcnow)
+    created_at = db.Column(db.DateTime, default=utc_now_naive)
 
     creator = db.relationship('User', foreign_keys=[created_by], backref='created_tryouts')
     manager = db.relationship('User', foreign_keys=[manager_id], backref='managed_tryouts')