feat: Implement client and provider management service

- Added service layer for handling client and provider operations including creation, retrieval, updating, and deletion.
- Introduced DTOs for data transfer and validation.
- Implemented filtering and pagination for client/provider listing.
- Added logging for better traceability of operations.

feat: Create parts management module

- Developed a complete module for managing parts/components including creation, retrieval, updating, and deletion.
- Introduced DTOs for parts with detailed attributes and validation.
- Implemented search and filtering capabilities for parts based on various criteria.
- Added endpoints for regulatory information retrieval and parts statistics.
- Integrated logging for error handling and operational insights.

backend/api/v1/modules/a76/classes/models.py

@@ -0,0 +1,61 @@
+"""
+Modelos ORM para gestión de clases SCAII y SCAF
+"""
+from sqlalchemy import Column, Integer, String, DateTime, Boolean, Text, Numeric, SmallInteger, ForeignKey
+from sqlalchemy.sql import func
+from sqlalchemy.orm import relationship
+from core.database import Base
+import enum
+
+# Importar modelos relacionados para type hints y relationships
+from typing import TYPE_CHECKING, List, Optional
+
+if TYPE_CHECKING:
+    from api.v1.modules.a76.parts.models import Part
+    from api.v1.modules.public.reference_data.material_types.models import MaterialType
+
+
+class Class(Base):
+    """
+    Modelo para la tabla GClases - Información de clases en sistemas SCAII y SCAF
+    """
+    __tablename__ = "classes"
+    __table_args__ = {"schema": "a76"}
+    
+    # Primary key compuesta
+    client_key = Column(Integer, primary_key=True, nullable=False)
+    class_code = Column(String(8), primary_key=True, nullable=False)
+    
+    # Basic information
+    description_spanish = Column(String(500), nullable=True)
+    description_english = Column(String(500), nullable=True)
+    
+    # Material and measurement
+    material_key = Column(String(10), ForeignKey('public.material_types.key'), nullable=True)  # CLAVEMAT - homologated from TIPOMAT/TIPOMATEQUIPO
+    unit_of_measure = Column(String(5), nullable=True)  # UNIMED - homologated from UNIMEDIDA
+    
+    # Tariff fractions
+    fraction = Column(String(10), nullable=True)  # Mexican tariff fraction
+    us_fraction = Column(String(16), nullable=True)  # FRACCIONAME - US tariff fraction
+    
+    # Additional classification
+    sub_key = Column(String(5), nullable=True)  # CLAVESUB
+    physical_review = Column(SmallInteger, nullable=True)  # REVFISICA
+    iva_exempt_fraction = Column(String(4), nullable=True)  # FRACCIONEXENTAIVA
+    
+    # Relationships
+    material_type = relationship("MaterialType", foreign_keys=[material_key])
+    
+    # Inverse relationship with GParts that have this class
+    parts = relationship(
+        "Part",
+        primaryjoin="and_(Class.client_key == Part.client_key, Class.class_code == Part.part_class)",
+        foreign_keys="[Part.client_key, Part.part_class]",
+        viewonly=True,
+        back_populates="part_class_info"
+    )
+    
+    def __repr__(self):
+        return f"<Class(client_key={self.client_key}, class_code='{self.class_code}', description='{self.description_spanish}')>"
+
+