feat(backend): Update models and endpoints configuration

- Enhanced ticket and comment models with proper relationships
- Updated client_profile model for better data handling
- Improved auth endpoint with better error handling
- Updated main app configuration and imports
- Added new dependencies to requirements.txt
- Enhanced tickets endpoint with attachment support

backend/app/models/__init__.py

@@ -7,6 +7,7 @@ from .comment import TicketComment
 from .system import System
 from .category import Category
 from .client_profile import ClientProfile
+from .attachment import TicketAttachment
 
 __all__ = [
     "User",
@@ -15,5 +16,6 @@ __all__ = [
     "TicketComment",
     "System",
     "Category",
-    "ClientProfile"
+    "ClientProfile",
+    "TicketAttachment"
 ]

backend/app/models/client_profile.py

@@ -8,12 +8,15 @@ Almacena información detallada de la empresa cliente
 from sqlalchemy import String, Boolean, DateTime, ForeignKey, Text, Numeric
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from sqlalchemy.dialects.postgresql import UUID
-from typing import Optional
+from typing import Optional, TYPE_CHECKING
 import uuid
 from datetime import datetime
 
 from app.core.database import Base
 
+if TYPE_CHECKING:
+    from app.models.tenant import Tenant
+
 
 class ClientProfile(Base):
     """Modelo de Perfil de Cliente Empresarial."""

backend/app/models/comment.py

@@ -64,6 +64,11 @@ class TicketComment(Base):
     # Relationships
     ticket: Mapped["Ticket"] = relationship("Ticket", back_populates="comments")
     author: Mapped["User"] = relationship("User")
+    attachments: Mapped[list["TicketAttachment"]] = relationship(
+        "TicketAttachment",
+        back_populates="comment",
+        cascade="all, delete-orphan"
+    )
     
     def __repr__(self) -> str:
         return f"<TicketComment {self.id} by {self.author_id}>"

backend/app/models/ticket.py

@@ -126,6 +126,12 @@ class Ticket(Base):
         cascade="all, delete-orphan"
     )
     
+    attachments: Mapped[list["TicketAttachment"]] = relationship(
+        "TicketAttachment",
+        back_populates="ticket",
+        cascade="all, delete-orphan"
+    )
+    
     # ✅ AÑADIDOS: Constraints según schema.sql
     __table_args__ = (
         UniqueConstraint('tenant_id', 'ticket_number', name='uq_tickets_tenant_number'),