chore(lint): trier les imports, sauf la facade des modeles

Active la regle isort (I) de ruff. 45 fichiers reordonnes, aucun
changement de comportement : la suite passe avant comme apres.

app/models/__init__.py en est exclu. Ses imports sont ranges en onze
couches commentees qui decrivent le graphe de dependances ; trier par
ordre alphabetique laisse chaque titre au-dessus d un import qu il ne
decrit pas, et ce fichier n a qu un role, etre lu.

Commit isole, comme le formatage : un diff de brassage ne doit pas
servir de couverture a un changement de comportement.

app/discord_bot.py

@@ -6,21 +6,22 @@ This module provides a persistent bot that handles:
 - Daily reminders at 18:00 EDT for upcoming events
 """
 
-import os
+import asyncio
 import json
 import logging
+import os
 import tempfile
-import time
-import asyncio
 import threading
+import time
 import traceback
 from datetime import datetime, timedelta
+from queue import Empty, Queue
 from zoneinfo import ZoneInfo
-from queue import Queue, Empty
-from discord import Intents
-from discord.ext import commands
+
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from apscheduler.triggers.cron import CronTrigger
+from discord import Intents
+from discord.ext import commands
 from dotenv import load_dotenv
 
 load_dotenv()
@@ -453,8 +454,8 @@ class TeamTryoutsBot(commands.Bot):
     async def handle_one_on_one_approve(self, coach, message_id, request_id, channel):
         """Handle coach approving a One on One request."""
         try:
-            from app.models import OneOnOneRequest
             from app.extensions import db
+            from app.models import OneOnOneRequest
 
             request = OneOnOneRequest.query.get(request_id)
             if not request:
@@ -498,8 +499,8 @@ class TeamTryoutsBot(commands.Bot):
     async def handle_one_on_one_reject(self, coach, message_id, request_id, channel):
         """Handle coach rejecting a One on One request."""
         try:
-            from app.models import OneOnOneRequest
             from app.extensions import db
+            from app.models import OneOnOneRequest
 
             request = OneOnOneRequest.query.get(request_id)
             if not request:
@@ -743,14 +744,15 @@ class TeamTryoutsBot(commands.Bot):
     async def _send_daily_reminders_impl(self):
         """Internal implementation of daily reminders with proper app context."""
         try:
+            from sqlalchemy.orm import joinedload
+
             from app.models import (
                 Match,
-                Tryout,
                 MatchParticipant,
-                TryoutRegistration,
                 OneOnOneRequest,
+                Tryout,
+                TryoutRegistration,
             )
-            from sqlalchemy.orm import joinedload
 
             now = datetime.now(self.timezone)
             tomorrow = now.date() + timedelta(days=1)