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/dto.py

@@ -0,0 +1,97 @@
+"""
+DTOs (Data Transfer Objects) para módulo de clases SCAII y SCAF
+Reemplaza schemas.py siguiendo enfoque DDD y estilo NestJS
+"""
+from pydantic import BaseModel, Field
+from typing import Optional
+from datetime import datetime
+
+
+class ClassCreateDTO(BaseModel):
+    """DTO para crear una clase"""
+    client_key: int = Field(..., description="Client key")
+    class_code: str = Field(..., max_length=8, description="Class code")
+    description_spanish: Optional[str] = Field(None, max_length=500, description="Description in Spanish")
+    description_english: Optional[str] = Field(None, max_length=500, description="Description in English")
+    material_key: Optional[str] = Field(None, max_length=10, description="Material key (homologated TIPOMAT/TIPOMATEQUIPO)")
+    unit_of_measure: Optional[str] = Field(None, max_length=5, description="Unit of measure (homologated UNIMEDIDA)")
+    fraction: Optional[str] = Field(None, max_length=10, description="Mexican tariff fraction")
+    us_fraction: Optional[str] = Field(None, max_length=16, description="US tariff fraction")
+    sub_key: Optional[str] = Field(None, max_length=5, description="Sub classification key")
+    physical_review: Optional[int] = Field(None, description="Physical review indicator")
+    iva_exempt_fraction: Optional[str] = Field(None, max_length=4, description="IVA exempt fraction")
+
+    class Config:
+        from_attributes = True
+
+
+class ClassUpdateDTO(BaseModel):
+    """DTO para actualizar una clase"""
+    description_spanish: Optional[str] = Field(None, max_length=500, description="Description in Spanish")
+    description_english: Optional[str] = Field(None, max_length=500, description="Description in English")
+    material_key: Optional[str] = Field(None, max_length=10, description="Material key (homologated TIPOMAT/TIPOMATEQUIPO)")
+    unit_of_measure: Optional[str] = Field(None, max_length=5, description="Unit of measure (homologated UNIMEDIDA)")
+    fraction: Optional[str] = Field(None, max_length=10, description="Mexican tariff fraction")
+    us_fraction: Optional[str] = Field(None, max_length=16, description="US tariff fraction")
+    sub_key: Optional[str] = Field(None, max_length=5, description="Sub classification key")
+    physical_review: Optional[int] = Field(None, description="Physical review indicator")
+    iva_exempt_fraction: Optional[str] = Field(None, max_length=4, description="IVA exempt fraction")
+
+    class Config:
+        from_attributes = True
+
+
+class ClassResponseDTO(BaseModel):
+    """DTO para respuesta de clase"""
+    client_key: int
+    class_code: str
+    description_spanish: Optional[str] = None
+    description_english: Optional[str] = None
+    material_key: Optional[str] = None
+    unit_of_measure: Optional[str] = None
+    fraction: Optional[str] = None
+    us_fraction: Optional[str] = None
+    sub_key: Optional[str] = None
+    physical_review: Optional[int] = None
+    iva_exempt_fraction: Optional[str] = None
+
+    class Config:
+        from_attributes = True
+
+
+class ClassBasicDTO(BaseModel):
+    """DTO para información básica de clase"""
+    client_key: int
+    class_code: str
+    description_spanish: Optional[str] = None
+    description_english: Optional[str] = None
+    material_key: Optional[str] = None
+    fraction: Optional[str] = None
+
+    class Config:
+        from_attributes = True
+
+
+class ClassListDTO(BaseModel):
+    """DTO para lista de clases"""
+    classes: list[ClassBasicDTO]
+    total: int
+    page: int
+    size: int
+
+    class Config:
+        from_attributes = True
+
+
+class ClassSearchDTO(BaseModel):
+    """DTO para búsqueda de clases"""
+    client_key: Optional[int] = Field(None, description="Filter by client key")
+    class_code: Optional[str] = Field(None, description="Search by class code")
+    description: Optional[str] = Field(None, description="Search in descriptions")
+    material_key: Optional[str] = Field(None, description="Filter by material key")
+    fraction: Optional[str] = Field(None, description="Filter by tariff fraction")
+    physical_review: Optional[int] = Field(None, description="Filter by physical review indicator")
+
+    class Config:
+        from_attributes = True
+