style: f-strings sans placeholder signalees par ruff (F541)

Aucun changement de comportement. Les chaines concernees ne contenaient
aucune substitution.

A noter pour plus tard : run_https.py conserve une banniere en caracteres
semi-graphiques, du meme type que celle qui faisait planter security_scan.py
sur une console Windows en cp1252. Le script n'etant lance qu'en
developpement et de facon explicite, le point est signale sans etre corrige
ici.

Co-Authored-By: Claude Opus 5 <[email protected]>

app/supporting_scripts/run_https.py

@@ -107,13 +107,13 @@ def main():
     # Wrap the Flask app with the HTTPS middleware
     app.wsgi_app = ForceHTTPSMiddleware(app.wsgi_app)
 
-    print(f'\n╔══════════════════════════════════════════════════════╗')
-    print(f'║  TEAM TRYOUTS - Development HTTPS Server            ║')
-    print(f'╠══════════════════════════════════════════════════════╣')
+    print('\n╔══════════════════════════════════════════════════════╗')
+    print('║  TEAM TRYOUTS - Development HTTPS Server            ║')
+    print('╠══════════════════════════════════════════════════════╣')
     print(f'║  URL: https://{host}:{port}                      ║')
-    print(f'║  Cert: self-signed (accept browser warning)         ║')
-    print(f'║  Press Ctrl+C to stop                               ║')
-    print(f'╚══════════════════════════════════════════════════════╝\n')
+    print('║  Cert: self-signed (accept browser warning)         ║')
+    print('║  Press Ctrl+C to stop                               ║')
+    print('╚══════════════════════════════════════════════════════╝\n')
 
     # Create Waitress server with the SSL-wrapped socket
     server = create_server(