Étape 8 : connexion par mot de passe pour la coordination

Deux systèmes d'authentification, une même session JWT :
- COORDINATION : login e-mail + mot de passe (bcrypt), POST .../auth/login ;
  POST .../auth/change-password pour le compte courant
- RÉFÉRENTS / BÉNÉVOLES : lien magique inchangé, mais refusé pour un compte
  qui a un mot de passe

- Account.password_hash (nullable) + migration 0002 ; propriété auth_method
  ("password" / "magic_link") exposée dans AccountRead
- app/auth/passwords.py : hash/verify bcrypt, longueur mini 10
- Création de compte : password requis pour COORDINATOR, interdit sinon
- seed : la coordination de démo a un mot de passe, affiché dans le résumé
- 12 tests (login ok/ko, séparation des deux systèmes, change-password,
  validation à la création) ; 129 tests au total ; alembic check vert

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017uUsRg7XzopkCPWimwg9ZM

backend/uv.lock

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+
 [[package]]
 name = "benevoles-backend"
 version = "0.1.0"
 source = { editable = "." }
 dependencies = [
     { name = "alembic" },
+    { name = "bcrypt" },
     { name = "fastapi" },
     { name = "openpyxl" },
     { name = "psycopg", extra = ["binary"] },
@@ -73,6 +112,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "alembic", specifier = ">=1.14" },
+    { name = "bcrypt", specifier = ">=4.1" },
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