Refactor models and services in A76 module

- Updated GBultoService to use models.Package instead of models.GBulto.
- Refactored Part model to use SQLAlchemy 2.0 style with Mapped and mapped_column.
- Added timestamps (created_at, updated_at, deleted_at) to various pedimento models.
- Improved relationships and foreign key constraints in pedimento models.
- Updated PermissionRuleOct and Seal models to use Mapped and mapped_column.
- Changed DTO configuration from orm_mode to from_attributes for better compatibility.
- Removed obsolete models (models.py and models_ped.py) from the repository.

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

@@ -1,22 +1,35 @@
-from sqlalchemy import Column, String, DECIMAL, DateTime, ForeignKey
-from sqlalchemy.orm import declarative_base
+from typing import Optional
+from datetime import datetime
+from decimal import Decimal
+from sqlalchemy import DateTime, Integer, String, DECIMAL, ForeignKey, PrimaryKeyConstraint, ForeignKeyConstraint, UniqueConstraint
 from sqlalchemy.sql import func
-
+from sqlalchemy.orm import Mapped, mapped_column
 from core.database import Base
 
-class GBulto(Base):
-    __tablename__ = "gbultos"
-    __table_args__ = {"schema": "a76"}
 
-    CLAVE = Column(String(5), primary_key=True, nullable=False)
-    DESCRIPTION = Column(String(40), nullable=True)
-    DESCRIPTIONI = Column(String(40), nullable=True)
-    WEIGHT_UNIT = Column(DECIMAL(19, 8), nullable=True)
-    PLURALS = Column(String(4), nullable=True)
-    PLURAL_IN = Column(String(4), nullable=True)
-    CODE_ACE = Column(String(4), nullable=True)
-    CODE_AAMEX = Column(String(9), nullable=True)
-    CREATED_AT = Column(DateTime, server_default=func.now(), nullable=False)
-    UPDATED_AT = Column(DateTime, server_default=func.now(), onupdate=func.now(), nullable=False)
-    tenant_id = Column(String, ForeignKey("a76.tenants.id"), nullable=False)
+class Package(Base):
+    __tablename__ = "packages"  # GBultos
+    __table_args__ = (
+        PrimaryKeyConstraint('id', name='packages_pkey'),
+        UniqueConstraint('key', name='packages_key_ukey'),
+        ForeignKeyConstraint(['tenant_id'], ['a76.tenants.id'], name='fk_packages_tenant'),
+        {"schema": "a76"}
+    )
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    tenant_id: Mapped[int] = mapped_column(Integer, nullable=False, index=True)
+    key: Mapped[str] = mapped_column(String(5))
+    description_es: Mapped[Optional[str]] = mapped_column(String(40))
+    description_en: Mapped[Optional[str]] = mapped_column(String(40))
+    weight_unit: Mapped[Optional[Decimal]] = mapped_column(DECIMAL(19, 8))
+    plurals: Mapped[Optional[str]] = mapped_column(String(4))
+    plural_in: Mapped[Optional[str]] = mapped_column(String(4))
+    code_ace: Mapped[Optional[str]] = mapped_column(String(4))
+    code_aamex: Mapped[Optional[str]] = mapped_column(String(9))
+    
+    # Timestamps
+    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=func.now(), onupdate=func.now())
+    deleted_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+