fix(auth): flexibilizar login por email/usuario, asegurar hash admin123 y corregir cookies sobre HTTP

backend/app/repositories/user_repository.py

@@ -1,5 +1,5 @@
 from typing import Optional, List
-from sqlalchemy import func
+from sqlalchemy import func, or_
 from app.models.user import User
 from app.repositories.base_repository import BaseRepository
 
@@ -10,10 +10,25 @@ class UserRepository(BaseRepository[User]):
         super().__init__(User)
 
     def get_by_email(self, email: str) -> Optional[User]:
-        """Obtiene un usuario por su dirección de email normalizada."""
+        """Obtiene un usuario por su dirección de email normalizada o alias de usuario."""
         if not email:
             return None
-        return User.query.filter(func.lower(User.email) == email.strip().lower()).first()
+        clean = email.strip().lower()
+        user = User.query.filter(func.lower(User.email) == clean).first()
+        if user:
+            return user
+        # Si el usuario ingresó solo el nombre de cuenta (ej. 'admin' o 'bedelia')
+        if '@' not in clean:
+            user = User.query.filter(
+                or_(
+                    func.lower(User.email) == f"{clean}@edu-space.com",
+                    func.lower(User.name) == clean,
+                    func.lower(User.role) == clean.upper()
+                )
+            ).first()
+            if user:
+                return user
+        return None
 
     def get_active_users(self) -> List[User]:
         """Obtiene todos los usuarios con cuenta activa."""

backend/classrooms_db.sql

@@ -1647,7 +1647,7 @@ COPY public.subjects (id, code, name, description, department, credits, active,
 --
 
 COPY public.users (id, email, password_hash, name, role, is_active, created_at, last_login, preferred_language, theme_preference, role_id) FROM stdin;
-1	admin@edu-space.com	pbkdf2:sha256:600000$oIjd4T0sIDkJeOcn$129d545ff9af76998ab815cc403f588fa7137a5d0dc78941a531b0c88d776b0a	System Administrator	ADMIN	t	2026-09-03 02:08:29.597255	2026-09-05 01:32:51.778156	es	light	1
+1	admin@edu-space.com	pbkdf2:sha256:1000000$7UJAkGOl42ZHvDk8$f38ef5fe9b7247692b812abe9199df2d25c015e04b3807267b0f43536817f5c6	System Administrator	ADMIN	t	2026-09-03 02:08:29.597255	2026-09-05 01:32:51.778156	es	light	1
 3	carlostellocba@gmail.com	pbkdf2:sha256:600000$O0J5tLN2iWVNAZlB$ac8d4b424e4272e1c15703ff53626432f69396877ed3f8be283821a1147c4a05	Carlos Tello	Alumno	t	2026-09-03 04:42:24.060312	2026-09-03 07:20:39.403354	\N	dark	6
 \.
 

backend/init_db.py

@@ -364,9 +364,7 @@ def init_database():
                         u_obj.role_id = r_match.id
                     u_obj.role = u_info['role_code']
                     u_obj.is_active = True
-                    if not u_obj.check_password("admin123"):
-                        u_obj.set_password("admin123")
-                        print(f"   [*] Clave de {u_info['email']} restablecida a 'admin123'.")
+                    u_obj.set_password("admin123")
                     if not u_obj.preferred_language:
                         u_obj.preferred_language = "es"
                     if not u_obj.theme_preference: