feat: Add currency management feature with CRUD operations

- Introduced a new template for currency overview and management (`currencies.html`).
- Updated footer to include attribution to AllYouCanGET.
- Added "Currencies" link to the main navigation header.
- Implemented end-to-end tests for currency creation, update, and activation toggling.
- Created unit tests for currency API endpoints, including creation, updating, and activation toggling.
- Added a fixture to seed default currencies for testing.
- Enhanced database setup tests to ensure proper seeding and migration handling.

main.py

@@ -13,6 +13,7 @@ from routes.consumption import router as consumption_router
 from routes.production import router as production_router
 from routes.equipment import router as equipment_router
 from routes.reporting import router as reporting_router
+from routes.currencies import router as currencies_router
 from routes.simulations import router as simulations_router
 from routes.maintenance import router as maintenance_router
 
@@ -41,4 +42,5 @@ app.include_router(production_router)
 app.include_router(equipment_router)
 app.include_router(maintenance_router)
 app.include_router(reporting_router)
+app.include_router(currencies_router)
 app.include_router(ui_router)