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.

routes/ui.py

@@ -19,6 +19,7 @@ from models.simulation_result import SimulationResult
 from routes.dependencies import get_db
 from services.reporting import generate_report
 from models.currency import Currency
+from routes.currencies import DEFAULT_CURRENCY_CODE, _ensure_default_currency
 
 
 CURRENCY_CHOICES: list[Dict[str, Any]] = [
@@ -153,6 +154,38 @@ def _load_currencies(db: Session) -> Dict[str, Any]:
     return {"currency_options": items}
 
 
+def _load_currency_settings(db: Session) -> Dict[str, Any]:
+    _ensure_default_currency(db)
+    records = db.query(Currency).order_by(Currency.code).all()
+    currencies: list[Dict[str, Any]] = []
+    for record in records:
+        code_value = getattr(record, "code")
+        currencies.append(
+            {
+                "id": int(getattr(record, "id")),
+                "code": code_value,
+                "name": getattr(record, "name"),
+                "symbol": getattr(record, "symbol"),
+                "is_active": bool(getattr(record, "is_active", True)),
+                "is_default": code_value == DEFAULT_CURRENCY_CODE,
+            }
+        )
+
+    active_count = sum(1 for item in currencies if item["is_active"])
+    inactive_count = len(currencies) - active_count
+
+    return {
+        "currencies": currencies,
+        "currency_stats": {
+            "total": len(currencies),
+            "active": active_count,
+            "inactive": inactive_count,
+        },
+        "default_currency_code": DEFAULT_CURRENCY_CODE,
+        "currency_api_base": "/api/currencies",
+    }
+
+
 def _load_consumption(db: Session) -> Dict[str, Any]:
     grouped: defaultdict[int, list[Dict[str, Any]]] = defaultdict(list)
     for record in (
@@ -637,3 +670,10 @@ async def simulations_view(request: Request, db: Session = Depends(get_db)):
 async def reporting_view(request: Request, db: Session = Depends(get_db)):
     """Render the reporting view with scenario KPI summaries."""
     return _render(request, "reporting.html", _load_reporting(db))
+
+
+@router.get("/ui/currencies", response_class=HTMLResponse)
+async def currencies_view(request: Request, db: Session = Depends(get_db)):
+    """Render the currency administration page with full currency context."""
+    context = _load_currency_settings(db)
+    return _render(request, "currencies.html", context)