chore: fix python style violations

Co-authored-by: OpenAI/GPT-5.6-Terra <vibecoder@antoineve.me>
Co-authored-by: OpenAI/GPT-5.6-Luna <vibecoder@antoineve.me>
Co-authored-by: MiniMax/MiniMax-M3 <vibecoder@antoineve.me>
Co-authored-by: DeepSeek/DeepSeek-v4-Flash <vibecoder@antoineve.me>

app/models.py

@@ -1,8 +1,10 @@
-from app import db
-from datetime import date, time, datetime
+from datetime import date, datetime, time
+
 import sqlalchemy as sa
 import sqlalchemy.orm as so
 
+from app import db
+
 
 class WorkEntry(db.Model):
     __tablename__ = "work_entries"