feat: Implement general catalogs for INPC, Legends, Multi-Currency Types, Packages, Ports, Prevalidators, Signatures, Unit Conversions, and Units of Measure

- Added INPC management page with search functionality.
- Created Legends management page with filters for code and description.
- Implemented Multi-Currency Types management with search capabilities.
- Developed Packages management page with filtering options.
- Introduced Ports management page with authentication and data fetching.
- Added Prevalidators management page with search filters.
- Implemented Signatures management page with search by name and position.
- Created Unit Conversions management page for conversion factors.
- Developed Units of Measure management pages for ACE, American, and OMA with data tables and create/edit dialogs.

backend/api/v1/modules/public/reference_data/countries/models.py

@@ -8,11 +8,13 @@ class Country(Base):
     __table_args__ = (
         PrimaryKeyConstraint("m3_key", name="countries_pkey"),
         Index("ak_country_ame", "ame_key", unique=True),
-        {"schema": "public"},  # opcional
+        {"schema": "public", "extend_existing": True},  # opcional
     )
 
-    m3_key: Mapped[str] = mapped_column(String(3), nullable=False)  # clave M3
-    mex_key: Mapped[str] = mapped_column(String(2), nullable=False)  # clave país México
+    m3_key: Mapped[str] = mapped_column(
+        String(3), primary_key=True, nullable=False)  # clave M3
+    mex_key: Mapped[str] = mapped_column(
+        String(2), nullable=False)  # clave país México
     ame_key: Mapped[str] = mapped_column(
         String(2), nullable=False
     )  # clave país América / regional